I wouldn't hit anyone with all my strength unless I meant to kill them. Anything less is sparring, or playfighting to me. But I know most people haven't known and trained for conflict the way I have, so my general rule is one of pacifism... or, in extreme situations, grappling takedowns. Anything requiring more than that is why I always have a firearm.
As for "hitting someone because you're angry"... I regard that as the realm of children. My nephews do that. It's cute, but they get reprimanded for it.
As for "hitting someone because you're angry"... I regard that as the realm of children. My nephews do that. It's cute, but they get reprimanded for it.