Besalel-
We have arvus..we(each one of us) are responsible for every other Yid. When they do an aveirah, HKB”H asks us why. what did we do to bring them to Torah and Mitzvos. We are all obligated to do kiruv. No yid can be written off. Even though that would be the easiest thing, but L’fum tzara agra.We may not be able to accomplish the kiruv with certain people. that is sad. We have to feel bad about that.