> In this case I genuinely believe the post was borderline criminal and grossly irresponsible given the situation the world was in on March 20, 2020.

You could rewrite this as "Not criminal". So you agree, the arrest was illegal. Great!

So, if someone said they wanted Brad Pitt to save them from the police, how likely do you think someone will take that seriously?

I would put it in the 0.001-0.00001% possibility. If you fear the mentally ill and make policy choices on that fear, you would necessarily have to ban free speech to mitigate such low risk.