I'd be wary of automatically writing off all NO priests and seminarians as heretical.  Think about what you're saying in the light of Catholic doctrine.

A heretic is someone who knowingly and pertinaciously persists in error.  Someone who doesn't know any better isn't a heretic.

Even if someone IS a heretic, what do you think the remedy might be?  Leaving them to their heresies or correcting their errors in charity?

Someone who doesn't know any better isn't a heretic.

I guess many of them are only Material heretics because they don't know any better and I think a person who unknowingly is a heretic is called that. Who knows, I am probably a material heretic because I do not know the more intricate parts of the faith. But I have never met a Novus Ordo priest who was truly Catholic. I have heard that since Vatican II, the modernists who run the seminaries have been persecuting the more traditional priests and elevating the heretics and the sodomites.

NO it is not wrong to make acts of corporal mercy by instructing the ignorant; it is especially good to teach the Latin Mass.

The Latin Mass can be taught to a "trad" and the trad priest could still become an apostate, heretic, etc.

I know of a priest of the SSPX who teaches the Novus Ordo seminarians how to say the Latin Mass. Is that wrong. If the Novus Ordo ordinations are invalid, then this would mean that a lot of people who are not truly priests will be going around play-acting the Latin Mass. Is this a kind of sacrilege?

Even if the New Rite of ordinations are valid, wouldn't it be wrong to teach heretics, as nearly all Novus Ordo seminarians are, because they do not ordain seminarians who are truly Catholic, to say the Latin Mass? Is a heretic's Mass pleasing to God?

Novus Ordo ordinations are still valid, at least up to this point, but as the unfolding apostasy of Rome continues, then the time will come when they are invalid.

The logic of your second paragraph is like leaving a sick person without giving them medicine; or passing a starving and dehydrated person without giving them food and drink. It's necessary to help new order "Catholics" become truly Catholic, and one of the most efficacious ways is to teach them the true Catholic Tridentine Mass, which also helps them see the irreverence, sacrilege, and error of their protestant mass. The graces bestowed upon them by God through the Tridentine Mass will help them see the diabolical disorientation the afflicts the new order church, and help them become more faithful and fruit bearing Catholics. Ultimately, by the grace of God, they can completely come home to the Faith.

You can't be a heretic - material or otherwise - if you don't know any better.  

You have to have learned an article of faith, knowingly rejected it and persisted in the error in the face of repeated correction to be a heretic.

No, that's not true. You don't have to "know better" to be a heretic.

The novus ordo seminarian does not have the devotions nor are
they capable of celebration of the traditional mass in its correct
form. They are not correctly formed as the seminarians were
before Vatican 2.
I have seen a novus ordo seminary, and it is more like a
club house, than a house of prayer.

Teaching Novus Ordo seminarians = teaching new dogs old tricks?

It's Napoli. How do I reveal my identity in this thread?