If true justice won, even if imposed by strength, I wouldn't mind. The problem is that people like to masquerade injustice as "justice" and then force it upon others, and that's bad.
But regardless, in the context of DOA, Hayabusa is justice and it would be awesome if he always won, lol
quite agree with your first sentence of your first statement. My concern is justice should not be given by the guy who judge them.
it may leads to the injustice in disguise like you said. it may also lead to retaliation circle even if it's justice. that's why we separate law from executive (sorry for my bad translation here).