Why do you want to share your opinions on controversial topics? What do you get out of it? No one cares about your opinions on incest except to dunk on you. You're not going to revolutionize society's opinions on incest. So stop doing that. There's a whole universe of non-politics and non-religion topics out there. Go find a cool one. Maybe explore music theory and analysis, plenty of people to talk to about that. Ma…
One person won't, but echo chambers definitely do solidify people's opinions. I'm old enough to have seen popular opinions on a lot of issues move during my own lifetime, and things really start to get extreme at about the point where people feel like they can't oppose the trend. That happens pretty much regardless of whether the new or old opinion was "right" or "wrong". And if the accepted opinion started out largely "right", it very often ends up getting pushed into a more extreme version that's closer to "wrong".
It's called "groupthink". It's one reason that having persistent handles isn't necessarily as good an idea as you'd think in online discussions. Which is itself an opinion close to some danger areas right now...