I think that this wasn't posted in the firearms forum because a video that says "everyone" needs to own an AR-15 is meant to reach a wider audience, including people like me, who finds guns irrelevant, unnecessary, and personally repugnant.
On the other hand, there is no way that that video would "sell" me on the idea.
Promoters would have more success selling videos to the blind, or audio books to the deaf, or bikinis to octagenarians.
So yes, I agree. It is better to preach to the choir than to the political forum.
BTW, it is not the gun issue that makes me a progressive or a Democrat. It's economic issues, social justice issues, etc., etc.