Eruv to save people from violating Shabbos?

Igros Moshe (OC V #28.22) Question Should an eruv be built to save people from violating Shabbos? Answer This is a dispute amongst Tanaaim? |It seems that there is no obligation to do it or even a mitzva to do it for them. Perhaps there is for those who were raised as irreligious. However since they were aware that there are religious Jews and that there are people who know more than their parents and nevertheless the didn’t change  that cancels out the fact that they were raised as irreligious.