I appreciate your last sentence, let me get to that after just a couple points: I'm not demanding, I'm encouraging. I will continue to encourage those on left to reconsider this tact, support for it, is dismissal of it's consequences. I do think attacking and berating those we disagree with has political fallout. It may not specifically on Maher, but it does generally.
I think if someone is silenced for being angry it's an apt time to call out "tone police" and I am in lockstep agreement with you that it's wrong to silence those people. There is a time to vent and rage, but I hope you agree there is also a time to persuade and educate. I fear the latter is being reduced in importance.