If Bran has the power to change the past, and the Night King knows this, perhaps he wants to go back and stop that piece of Dragonglass from ever piercing his heart? Thus stopping the existence of the white walkers altogether. In a way, that would make him a hero of sorts.
We’re going to rebuild the wall and the night King shirt
I’ve thought a few times, we might be cheering for the wrong team. Look at all the fighting, killing and hatred the living have. On the other side, the wights, the walkers, the NK, all seem to just mosey along doing their little undead thing, not fighting each other, or arguing at all. We’re going to rebuild the wall and the night King. Bran can’t change the past, whatever changes bran has done in the past would already have been seen in the present.
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Hodor was a normal boy who bran worked into and caused him to be like that for the rest of his life so whatever we have seen up until now, we know whatever bran changes will be seen in the present or future but I don’t think he could go back and amend anything that’s already happened. The children of the forest created The Night King to help defeat men, the first men to be specific. His purpose was to exterminate human beings from Westeros and that’s what he’s trying to do, presumably.