My point is that those people don't stay in their subs though.

You probably haven't been hanging out on the far/alt right subs, have you?

Most of the places you will have seen racist posts will be s/politics, s/worldnews, etc. You can't hide all subs like that and only have fluffy kittens on the front page. People mostly come to sites like this for the news and debate around it.

I have to also say I did often see the same level of racism on reddit, but it was often covered in weasel words. So rather than saying the jews were evil and behind everything they would say big pharma/ the banks/ the porn industry was conspiring against us then say "I wonder which group of people run those companies, I'm sure it's just a coincidence". Those comments would always get up voted on reddit and is I'd usually be the only one reporting them, I really hope that was down to the stupidity of casual readers.

So this is why I prefer it to be open. You hate to see the racist posts, good, that's a good and healthy reaction. However on reddit you may have well have been upvoting that same person's post, saying exactly the same thing just written in a more manipulative way. That is so dangerous. Yes, it feels better but you need to show it actually leads to better outcomes rather than allowing a more insidious political grooming.