How Much Slack Should Nutcases Get?

I'm applying to be a volunteer at a school, which seems a positive thing to do until you realize that the moment you go anywhere near children, that you immediately become a suspect.
After all, who in their right minds would want to help teenage kids with their tendency to extreme mood swings and, at least in Toronto, as likely to carry a Glock as a calculator.
One of your responsibilities in volunteering to help kids, many of whom have been ignored or worse by their own parents, is to get a police check. No big deal, if you've never harmed a flea.
But the thing is, if you are NOT in your right mind, even if you've harmed more than fleas. If you're nuts and do something very nutty and very criminal, you get a pass, providing that you are indeed nuts.

I don't know what's worse. Crazy or Stupid.
Kurt Vonnegut would love it.