Totally, it's a difficult situation to handle. There is a definite spectrum when it comes to these highly opinionated types, trying to defuse someones thoughts will end up landing you in more trouble. Last thing you want is to end up with a brawl with somebody who isn't worth the time.

I don't have the answers to your final questions. I need to expand my knowledge so I can begin understanding where these beliefs truly stem from and if there is anything we can do as bystanders to their life which can promote change in even the most difficult cases. As much as I dislike the way some people go on, I still believe we are all human and are the products of our environment and social circles. Change is always possible.