Recently a left wing, female politician in the UK had her career destroyed by an ill-advised tweet (as in, revealing her true thoughts about the working class voters who elected her). You would this that would have educated these people that what's sauce for the goose is sauce for the gander, but there's no sign it has.
People defend these sorts of vigilante actions by saying, those people aren't just expressing their opinions, they're saying hate speech. But almost all political opinions can be turned into moral faults though. If you support abortion you support murdering babies, you are a monster. If you support Palestine you support anti-semitism and terrorism, you are a monster. If you support (any right wing opinion), you are a monster.