This is a point that I wanted to make a long time ago on this very forum that I didn't think of when the discussion it was tied to was fresh. That's for the first part; the second one is from... "recent events".
My main problem with violence as a method of solving problems is that it tends to generate far too much collateral damage for it to be worth it. If you hit someone with deliberate intent to hurt, you think that they're ever gonna like you again? It's unlikely at best, since you just set the precedent that you will hurt people if you don't get your way. Violence is a tool, but an incredibly dangerous one at that. And for how dangerous it is, I think it's laughably ineffective most of the time. It changes if you're being violent in self-defense, but even then I'd exercise caution to make sure that your level of violence is proportional to the other person's level of violence. Don't shoot someone if they punch you in the face, you get what I mean?
And really, that applies to hurting people in general, especially during arguments. There's a reason I try to be as non-confrontational as possible when I correct people. If you're aggressive while correcting and you're right, that's fine, but if you're aggressive and you're wrong, people will call you out on that, you're gonna be stuck with your tail between your legs, and you may have over-escalated the situation. If you're not being aggressive and you're wrong, you'll still get called out on it, but at least you won't have turned it into a shouting match. Of course, I'm not at all counting being funny-aggressive. That's a whole different story; the difference there is intent, though depending on execution and place, that might get misinterpreted as aggressive-aggressive, so I would suggest taking care.
Then again, I don't have to deal with idiots and fools on a daily basis. Maybe if I worked the jobs some of you work, I'd lose my temper sooner, too. I'm not here to diss anyone, I'm just trying to make a point. I'm basically reading off my Guidebook to Not Being a Dick, and Why You Shouldn't Be a Dick Too (not an actual book, BTW, just one encoded in my brainmeats), and I'm feeling the urge to revise it because I think there may be errors in here.