These moderators were overwhelmingly MAGA/Trump supporters, so I'm sure you can guess what kind of posts they expected to see before they unblocked a new user.
This was all shared/revealed on Twitter, so take it as "evidence" with whatever grain of salt you like, but people didn't just make up these claims about what Parler was..
So while perhaps Parler claimed to be a place for open debate and unrestricted ideas, it is seems that was just a thin cover for their much more focused goal of being a home for all this extremist right-wing talk in America.
https://twitter.com/donk_enby/
She links to a bunch of other articles and sources as well, including lists of moderators etc...
I guess shutting down mosques that promoted terrorism led to more terrorism?
Just listen to the Parler executives account of what happened. Contrary to all the nonsense being spewed by ideologues, Parler did have a moderation policy that prohibited incitement to violence, and they did enforce it, but it was neither perfect nor instantaneous (since, by deliberate choice, only humans were involved). They also complied to the requests from the three tech titans, but of course that did not matter, their fate was sealed before the first letter was sent.
This is a moment of astonishing hypocrisy and terrible abuse of power. Silicon Valley has proven to half of America that the system is rigged beyond recourse, and for a number of those Americans that might be the straw that breaks the camels back, leading them into radicalization and terrorism. It would be very wise for all of us in tech, in any position of influence, to urge calm and dialogue and to provide space for all speech that is not urging violence. We are not children to throw away our country because of a single deranged fool. We need to show to the country that tech is not an instrument available to only those of a certain ideological bent and that we can talk and sort out our differences without violence or repression.