Yichusdic, really basic things. The requirement of ” lo sis alav chet” apllies only during first time or times when you rebuke the person. If he continues to do the aveira intentionally, you are allowed to publicaly yell at him etc. Look in the ” Chofets Chaim”. If it is a wise think to do, it depends. Stop, however, inventing all these modernishe reasons as to why one is not allowed to forcefully moche or be a kanoi.
