*Sigh* I know! I find it incredibly tedious and boring, that's why I like giving my characters the means to kill whoever they want so I can focus on the drama I actually enjoy. Like questioning if having the power to do something gives them the right to do it. Or how they handle life when they achieve their objectives and realize that doing that didn't give them what they wanted.
Its the fine line Superman writers have to walk, they've gotten it wrong at least as often as they get it right.
The ability to do anything doesn't mean the ability to do everything.
This is a scene from the Injustice series that I quite like discussing just that. The ability to act does not make it a good idea, even for a good cause. Most 'big' issues aren't simple enough to be solved in one action.
I've even seen a couple of fics here go into it, Brockton Bay needs a lot more than just the gangs to go away, it needs to be rebuilt, it needs jobs, it needs for it's citizens to be able to have and support a peaceful way of life. And that's a big damn problem, and no amount of face punching will make it happen.