“If we allowed, say Stormfront articles here, how many people would just go away and never come back?”
Well, if we only had an “ignore poster” button then probably close to zero. Let people police their own feed (without censoring what others can see) and the problem disappears.
Most people are too lazy to do that, they just choose to go elsewhere.
About 2 decades ago, I was part of a small group of conservatives participating on a small site.
The host, a nationally know guy, let 2 libs join and post.
The libs basically destroyed the site, until the owner let us block them.
The blocking took about a week before the liberal thugs left.