Blatent disregard for the health or safety of animals (INCLUDING FEEDERS BTW) should be infractable/bannable violation in my humble opinion. Plenty of people make mistakes, so the active disregard of basic health/safety/rights of living things would need to be undeniable.
ex:
"I just grab the rat by the tail and wack it on the wall"
"Here are the 3 legal, humane methods of euthanasia outlined by the AVMA"
"Yeah, forget all that, I'll just keep punching them in the face with brass knuckles"
ex:
"I think my snake might be sick"
"You need to house it separately to ensure you don't spread disease through the hobby when you inevitably sell your collection in 6 mo"
"Nah, it ate and pooped so it's fine, thanks for your concern though"