What damage did he do to kids?
Same thing many are damaged with, an ill-formed conscience which leads to erroneous judgment. I cannot go into ministry to guide people, especially young and open minds, with my opinions of truth. I must, and this priest did not, bring THE truth into the ministry; then a person can make a good judgment about it then decide, hopefully deciding the way of truth.
It is not easy to undo what a priest does. Even with proper documents and truth on my side, it always comes down to Fr. So & So said…and Deacon Gary is disregarded. You are the same way, you will take that idea you got from an errant priest over me and the proof which I show you from DR and NL and Magisterial teaching. Why is that you wonder? Because it validates the lifestyle that you want to live and to choose to live in truth is much harder. Here is the CCC about Erroneous Judgment. Go to the CCC and read the entire section on the conscience, it would be very beneficial.
IV. ERRONEOUS JUDGMENT
1790 A human being must always obey the certain judgment of his conscience. If he were deliberately to act against it, he would condemn himself. Yet it can happen that moral conscience remains in ignorance and makes erroneous judgments about acts to be performed or already committed.
1791 This ignorance can often be imputed to personal responsibility. This is the case when a man "takes little trouble to find out what is true and good, or when conscience is by degrees almost blinded through the habit of committing sin."59 In such cases, the person is culpable for the evil he commits.
1792 Ignorance of Christ and his Gospel, bad example given by others, enslavement to one’s passions, assertion of a mistaken notion of autonomy of conscience, rejection of the Church’s authority and her teaching, lack of conversion and of charity: these can be at the source of errors of judgment in moral conduct.
1793 If - on the contrary - the ignorance is invincible, or the moral subject is not responsible for his erroneous judgment, the evil committed by the person cannot be imputed to him. It remains no less an evil, a privation, a disorder. One must therefore work to correct the errors of moral conscience.
1794 A good and pure conscience is enlightened by true faith, for charity proceeds at the same time "from a pure heart and a good conscience and sincere faith."60