To assume you know someone well enough that you can and do predict their behavior and mental perspective is a gross and often tragic mistake, for it eliminates that person's freedom to create his or her own opinion and drastically affects the emerging picture of the relationship.
If people need to grow at their own rates, then you might ask, "In what way is it your opportunity to help others grow spiritually?" And I can offer two answers: first, it is appropriate to share your views when someone asks, and second, allow that you may know more of the situation, have greater insight into both the nature of the problem and the solution, than you might share with that person. A true spiritual teacher knows more than he or she necessarily verbalizes, using temperance and love to be guided to say what is appropraite without showing off his or her knowledge or saying what would not arise from the greatest care, kindness, and compassion.
I would like to comment on the God fiber within each living thing. This essence, this fiber of love and grace, runs in every vein, no matter how deeply buried. Each person has a God fiber, whatever their actions or hurt they have caused you or others.