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Grounds for Marriage Annulment in the Catholic Church
There are very well defined canonical grounds for Marriage Annulment. Once these
have been established marriage Annulment can proceed. It is important to
understand the grounds for Marriage Annulment before making application, and if in
doubt you should consult your local priest.
Insufficient use of reason (Canon 1095, 10)
You or your spouse did not know what was happening during the marriage
ceremony because of insanity, mental illness, or a lack of consciousness.
Grave lack of discretionary judgment concerning essential matrimonial rights and
duties (Canon 1095, 20)
You or your spouse was affected by some serious circuмstances or factors that
made you unable to judge or evaluate either the decision to marry or the ability to
create a true marital relationship.
Psychic-natured incapacity to assume marital obligations (Canon 1095, 30)
You or your spouse, at the time of consent, was unable to fulfill the obligations of
marriage because of a serious psychological disorder or other condition.
Ignorance about the nature of marriage (Canon 1096, sec. 1)
You or your spouse did not know that marriage is a permanent relationship between
a man and a woman ordered toward the procreation of offspring by means of some
sɛҳuąƖ cooperation.
Error of person (Canon 1097, sec. 1) Reasons for Marriage Annulment
You or your spouse intended to marry a specific individual who was not the
individual with whom marriage was celebrated. (For example, mail order brides;
otherwise, this rarely occurs in the United States.)
Error about a quality of a person (Canon 1097, sec. 2)
You or your spouse intended to marry someone who either possessed or did not
possess a certain quality, e.g., social status, marital status, education, religious
conviction, freedom from disease, or arrest record. That quality must have been
directly and principally intended.
Fraud (Canon 1098) Reasons for Marriage Annulment
You or your spouse was intentionally deceived about the presence or absence of a
quality in the other. The reason for this deception was to obtain consent to marriage.
Total willful exclusion of marriage (Canon 1101, sec. 2)
You or your spouse did not intend to contract marriage as the law of the Catholic
Church understands marriage. Rather, the ceremony was observed solely as a
means of obtaining something other than marriage itself, e.g., to obtain legal status
in the country or to legitimize a child.

Willful exclusion of children (Canon 1101, sec. 2)
You or your spouse married intending, either explicitly or implicitly, to deny the
other's right to sɛҳuąƖ acts open to procreation.
Willful exclusion of marital fidelity (Canon 1101, 12)
You or your spouse married intending, either explicitly or implicitly, not to remain
faithful.
Willful exclusion of marital permanence (Canon 1101, sec. 2)
You or your spouse married intending, either explicitly or implicitly, not to create a
permanent relationship, retaining an option to divorce.
Future condition (Canon 1102, sec. 2)
You or your spouse attached a future condition to your decision to marry, e.g., you
will complete your education, your income will be at a certain level, you will remain in
this area.
Past condition (Canon 1102, sec. 2)R
You or your spouse attached a past condition so your decision to marry and that
condition did not exist; e.g., I will marry you provided that you have never been
married before, I will marry you provided that you have graduated from college.
Present condition (Canon 1102, sec. 2)
You or your spouse attached a present condition to your decision to marry and that
condition did not exist, e.g., I will marry you provided you don't have any debt.
Force (Canon 1103)
You or your spouse married because of an external physical or moral force that you
could not resist.
Fear (1103)
You or your spouse chose to marry because of fear that was grave and inescapable
and was caused by an outside source.
Error regarding marital unity that determined the will (1099)
You or your spouse married believing that marriage was not necessarily an
exclusive relationship.
Error regarding marital indissolubility that determined the will (Canon 1099)
You or your spouse married believing that civil law had the power to dissolve
marriage and that remarriage was acceptable after civil divorce.
Error regarding marital sacramental dignity that determined the will (Canon 1099)
You and your spouse married believing that marriage is not a religious or sacred
relationship but merely a civil contract or arrangement.
Lack of new consent during convalidation (Canons 1157,1160)
After your civil marriage, you and your spouse participated in a Catholic ceremony
and you or your spouse believed that (1) you were already married, (2) the Catholic
ceremony was merely a blessing, and (3) the consent given during. the Catholic
ceremony had no real effect


Like I said in the OP, I don't think I agree with NO annulments, but here are the grounds with the Canons.

Grounds for Marriage Annulment in the Catholic Church
There are very well defined canonical grounds for Marriage Annulment. Once these
have been established marriage Annulment can proceed. It is important to
understand the grounds for Marriage Annulment before making application, and if in
doubt you should consult your local priest.

This may only apply to 0.0000001% of population.  Extremely rare.

That's why pre-marriage classes exist.  You can't claim "I didn't know" after the classes.

Again, marriage classes close this loophole.


Very, very few people are certifiably insane, which would make a marriage vow null and void.  Would only apply to 0.000001% of people.


Marriage classes explain all things about marriage.  One cannot claim ignorance after these classes.

Marriage classes.


Proper marriage classes would cover this rare situation.  People have to prove identity and provide baptismal records, etc.  Identity theft could still happen, but rare.

Ridiculous V2 garbage.  "For better or for worse" covers this situation.


More V2 garbage.  If the person you marry lied about "being ABLE to marry" (i.e. they were already married but said they weren't) this would be a main reason that lying could invalidate.  Or...that the person was impotent/sterile and knew so, but lied and said they were healthy.  Outside of these 2 reasons, any other "quality" is irrelevant.


If you go through marriage classes and agree to everything, and the priest "passes you" in the class.  And then you go before God in church and promise to fulfill marriage...that's a marriage.  No ifs, ands or buts.


Marriage classes.  If you pass the course, you are publicly agreeing to the Church's rules and denying all of the above. 


Again, marriage classes make these excuses impossible.

Marriage classes, again.  Also, even if one of the spouses were forced to marry because of a death threat or something...this would be extremely rare.


Can't claim any of these "errors" if you go through marriage classes.

marriage. classes. fixes. this. problem.

Pax, marriage classes don't prevent deceit.