Notice a pattern? Left wing heroes can say anything they want and Twitter doesn’t ban them.
Actor Peter Fonda called for violently assaulting Trump's underage child on Twitter in 2018 (his account was not permanently banned), and that's very typical posting from leftist celebrities on Twitter these past four years.
Thousands of violent posts were in the "Hang Mike Pence" Twitter trend that was going on the other day. People have been openly calling for executions for treason and similar on Twitter in relation to the Capitol riots. There was widespread cheering and celebrating when that woman got shot in the neck by Capitol Police, I read thousands of Tweets that were literally cheering for her death, all on Twitter, and nobody gives a fuck.
The double standard by Twitter is beyond disgusting. It's psychopath behavior.
That trended because Trump supporters built a gallows and chanted “Hang Mike Pence” at the Capitol on Wednesday.
* https://www.newsweek.com/twitter-stops-hang-mike-pence-trend...
Perhaps these bans are happening not because of political affiliation but due to the messages these particular people (e.g., Trump) are espousing.
Parler go banned because it's full of message calling for (e.g.) Mike Pence to be hanged and other such things, and Parler isn't / can't do much about it, and its infrastructure providers (AWS, app stores) do not want any part of it per their ToS.
No one has cut off Mitch McConnell because he hasn't been calling forth angry mobs to storm Congress (or the White House).