I don't know how it is on Voat, but on 8chan I'm a frequent user and poster of /leftypol/, titled "Leftist Politically Incorrect", which is basically the flip-side to the infamous /pol/ boards of {8,4}chan. On there people generally don't get banned for having "wrong" opinions (though it does sometimes happen). There are no votes, there are only threads on the board.
I like this a lot more. Taking 8chan as a whole, you get to see different sides. Recently there was something at 4chan's /pol/ where a janitor was removing posts of someone espousing left-wing opinions. The board moderator intervened and said that any political position is allowed on the board.
It really depends where you go, but you are right - the user base of a site is antagonistic to people with opposite views. But they can live side by side, even with an occasional 'raid'. I don't know if I can thank the founder of 8chan enough to have a place where people of my particular opinions (Marxism, socialism) can talk. I'm sure people across the spectrum say the same.
Take a look at /leftypol/ if you want and see that there are frequently debates between sides, and it's absolutely great. I wish I could say the same about /pol/. I posted a comment saying that no matter what position you are on, a vote re-count would be good for democracy. I was permanently banned for, and this is a direct quote: "defending jews". That was the reason.
Depends where you go. That's my 2c on the issue.