You are confusing actual results with people being on the right side of a conflict.
The NRA, even if it is an incompetent worthless organization as you suggest, at least is trying to stop the slippery slope towards a society of people who kneel to the wishes of the new king.
The corruption of police does not mean an excuse to de-arm the populace so they can be lose their freedoms to authoritarianism and the NRA supporting guns in every context, even ones that seemingly are awful, doesn't mean that they are awful. Perhaps the NRA supports cops doing awful things because they don't want to lose a large pillar of support.
Instead of criticizing the very people who are preventing society from crumbling into a new technocratic kingship, what about thanking them? What about saying "thanks NRA for encouraging the world to be filled with guns?"
Only those ignorant of history (and to be clear, I am not implying this is you, I am explicitly saying this is you) are against the NRA and it's wish to prevent the world from going to pre-democratic times in which only the king decided who should have arms.