They falsely claimed he'd made an actionable threat. We can't remove their power to request warrants and arrest people for legitimately threatening others, right?
They misused power.
I think there are ways to have a system where judges do that, without having to criminally prosecute either cops or judges.
But they lied to obtain the warrant.
Would welcome reform that makes it harder to lie on warrant affidavits, although again, that should be civil in nature.
Yes, we call that lying by omission.
They knew that information would result in the warrant not being granted, so they left it out.
A reasonable system would have required the investigator attached an unedited full screen image which included the post. And the magistrate attempted to view the post if possible to counter deceit. And required the magistrate had legal education.
[1] https://www.fire.org/research-learn/complaint-bushart-v-perr...