Sure, occasionally an otherwise obscure person might find themselves at the end of an unexpected shitstorm, but otherwise it generally affects more prominent users, who are well aware that anything mildly controversial can turn into lots of angry replies.
Is that even a real problem? Isn't it actually valuable information to know that people get really angry about this-and-that? Aren't researchers able to use this data to learn something about human behavior?
Seems to me like people want to blame technology for something that's really amplified human nature. A rehashing the old story of the "basically good" human corrupted by some foreign evil.