it honestly depends, most of the time in self defense only, HOWEVER, say you walk around the wrong hallway/alley, and you see 3 dudes closing in on you to bully you, i think you have every right to take first swing/crack, if they land a blow on you then the three of them are probably going to be wailing on you and you're done for after that, so going on the offensive is the only way to stifle some fear into them and maybe for you to have a chance.
but if it was in self defense, i'd probably give the dude the beating of his life, if he wants to try that shit once, i'm going to make sure he'll think very long and hard before trying it again, one silly push/punch isn't going to stop someone from trying shit again, the beating of their life will.
but if it was in self defense, i'd probably give the dude the beating of his life, if he wants to try that shit once, i'm going to make sure he'll think very long and hard before trying it again, one silly push/punch isn't going to stop someone from trying shit again, the beating of their life will.