I'd happily introduce him to it because no son of mine is gonna be a little *****. If he turns out to not love it, he doesn't have to keep at it but I'm gonna call him a homo every day and he'll have all kinds of emotional issues. So he'd better stick with it.
I would, but I'd be pretty judicious about making sure the kid has it drilled into his/her head that punches are only to be thrown during training or inside a ring. I think the kid would have to be old enough to be able to fully comprehend that before he/she even got started. My six-year-old nephew is heavily involved in wrestling and has some aggression issues - I don't think the wrestling is the root cause but I think without being taught that organized sports happen in a different sphere, it's really not helping. I really wish I'd boxed when I was younger. The self-esteem boost and emotional outlet would have saved me some serious teen angst. My (hypothetical) kids will most definitely be involved in SOMETHING that does that for them, whether or not boxing is what they do.