It worries me that you have students who admit to shooting guns at living things like cats. I would take time to have a real discussion about that, even if it has nothing to do with what I teach. But I'm the type who would stand up to a principal or others who would tell me to just teach what I'm meant to teach, because obviously, these kids aren't getting the message elsewhere. I couldn't punish them, I guess, but I could at least try talking, you know?