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Again, the mentality that the husband has somehow been wronged by forcing to pay child support or alimony comes implicitly from the notion that the wronged husband should be able to start a new family.

Disagree.  It has to do with an injustice and an undue burden on men, which forces them to live in poverty for the rest of their lives.  Some would want to get re-married, some would not.  The question is:  does the court return just and fair decisions in family court?  Absolutely not.  The intentions of the injured party, and what they plan on doing AFTER the divorce is irrelevant to the main concern of court injustice.

Both the husband and wife see the faults of the other and see the other as the cause of the marriage problems.  Both see themselves as the injured party, so how are they going to implement a prenup designed to protect the injured party?  Who is going to make the decision about who is at fault?  They have both committed mortal sins.  How could a prenup have envisioned the situation they are facing?

Lawyers make a living figuring these things out.  Have you ever read a leasing contract?  It covers almost every imaginable situation and is not over 20 pages long.

In your scenario, both spouses are at fault for causing turmoil, but still, the spouse who issues divorce proceedings (absent a church allowance) IS AT FAULT.  If the wife feels the need to separate for a time (assuming it is ok'ed by the Church) then ok.  If she were to go through with civil divorce, she must face the consequences of her abandonment of the marriage.  The husband still has a strict duty to support her and his children but THE COURTS WOULD NOT BE INVOLVED.  This is the PRIMARY purpose of all of this.  

I wouldn't enter a prenup.  I recognize that I am obliged before God to provide for my wife and children ... even if my wife were to leave me for no fault of my own.  I would give them more than what the divorce settlements typically provide.

My own *non-Catholic, non-religious* father had this attitude. Some 25 years after he divorced my mother and children are no longer an issue, he still feels a responsibility to make sure her basic needs are met. Now, he's seldom had to put this to practice as she's quite self-sufficient, but the attitude is still there. He's repaired her porch, painted her house ... these days he just makes sure my brothers take care of whatever she needs which isn't difficult because they have a similar attitude about taking care of their aging parents.

I recognize that I am obliged before God to provide for my wife and children ... even if my wife were to leave me for no fault of my own.  I would give them more than what the divorce settlements typically provide.

The point is that you wouldn't be ABLE to give more than the courts told you too, because you'd be left to live on $400 a month, which is impossible.  You wouldn't be able to fix the leaky pipe, paint the house or whatever, because you'd be working a 2nd job just to survive.