Problem is, we live in a culture where we are expected to conform to so called mainstream opinion as if opinion itself were a monolith. Even worse, far too many people (including people on this forum) are trained either subconsciously or otherwise to shout down any differing opinion in increasingly abusive ways. Militant attitudes based on a few headlines and a 5 minute news segment. Now you're an expert, now you can tell others to go F themselves etc. God help us.
This has always been true though. Mainstream opinion has always marginalised people that are different. Religion, social mores all seek to create a them and us differentiation, and often they want to enforce compliance as well. Mainstream opinion can change however if your arguments are good enough. extreme examples look at south africa, where the whites eventually gave up their power in the face of overwhelming world opinion as an example of the former. Look at NZ views on abortion as an example of the later.
The only thing we can do as members of a forum is work to moderate the anti statements and ensure that they stay as arguments, expressing opinion or fact about the subject, but do not degenerate into pissing matches or personal attacks.
Personally i have a habit of blocking trolls and calling people when they move away from doing these things. I especially hate when people tell me or others what they
have to do instead of create arguments to debate the point and call them up on it really quickly.