That's how the left and its operatives in the arts, media, politics, and social 'movements' expresses itself: with murder, threats, ultimatums, bigotry, and identity politics that pressure everyone who isn't under their narrative to either disappear or be slaughtered.
Does Pearl Jam ever intend to show similar posters in China to protest that country's non-elected President or go around slandering the Supreme leader of Iran? Because if they did, no amount of American diplomatic pressure would get them released from the prisons they'd be locked up in.
But sure, take shots at Trump, knowing he can't do anything to you. 150% coward behavior.