Streisand effect would be desirable in this case because then everyone would know it wasn't actually the NRA that produced the video and that it isn't an official position of the NRA.
I have friends who are big-time NRA supporters. They regularly share articles on facebook that mock this kind of thing -- nitpicking inconsistencies, claiming they don't understand various points, etc. I wouldn't be surprised if the NRA itself has shared this video, with a clickbaity title like "when gun-grabbing idiots run out of arguments, they do THIS instead" and a counterargument below it that uses the word "stupid" or "moronic" at least 4 times.