I see the nastiness as a necessary evil of free speech platforms. Compare that to LinkedIn where there is virtually no nastiness and virtually no interesting conversations happening.
-- and without the crazies I'm not sure it'd be as sticky as it is... Part of the fun is saying "you honestly believe that what the fuck is wrong with you?" Then getting banned from r/the_donald for being a 'libtard' /s
(disclaimer: voted for Bernie - proud libtard here)
Few interesting conversations happen there, just 'circle-jerks'.
And once you've created a LinkedIn account they use dark-patterns to keep you there, and bombard you with spam.
If any site is ripe for competition it is LinkedIn.