My impression is that they didn’t say “hey we don’t have customer information but we don’t service violent groups and we will responsibly investigate and discontinue service to offenders.”
Their vibe was much more defiant, like, “we designed this to be anonymous and specifically intend/expect for it to be used in any way regardless of legality and are okay with it.”
Is it right for the US to be the global arbiter of this issue and domains in general? Of course not.
If that's disqualifying, a lot of US government contractors are in trouble.
That is also what Signal does. Or absolutely any end-to-end encrypted communication service at all - these are explicitly designed not to retain details of communication.
Do you want to declare them terrorists too?
Meanwhile, Signal requires a phone number, so it knows much more about your identity than A/I did.
Several fediverse instances have the same thing. It's just a freeform textbox saying why do you want an account.
Now, if you are against private conversations, please state so clearly so we know which side of the fence you lean towards.