It’s not an official requirement anywhere I’ve heard of, but I do recall cases where people have noticed police departments declining to hire applicants who scored too high on their aptitude test. I think someone even sued over it, but the court found that being too smart was not a protected class, so the department was within their rights to do that. Or something like that, it’s been a while since that story broke.
The analysis I read from a lawyer explained how Wisconsin’s state laws on self defense are weirdly complex, and due to the exact order of events, under those laws, his intent technically didn’t matter, and that’s why it was inadmissible evidence. In most states it would be admissable, and he would be guilty. He even listed the laws out and while I don’t recall any of the details now, it did seem perfectly logical to my layman’s understanding. So it’s not that the judge was biased, it’s just that Rittenhouse, through dumb luck, happened to fall through a legal loophole. Wisconsin needs to fix it’s laws, because it’s abundantly clear he wanted to kill those people and morally speaking, I consider him to be an unrepentant murderer.