Let's not pretend that the technical legality of Rittenhouse's actions make him any less a piece of shit. And he certainly wasn't trying to rid the world of a pedo, as he had no way of knowing that. So acting like it somehow makes things better is quite disingenuous.
He went looking to use his rifle, and got himself in deep enough to create a scenario where he could get away with doing so. Nothing more admirable than that.