To me - it rather looks like a purposeful bait and switch manipulation targeted at people who search for TV show trailers on YouTube with the intention to influence them (and as you said - "make them fearful of blacks").

As I mentioned - I've stumbled upon other channels doing the exact same thing following the same formula.

I don't think it's just racist people who happened to upload such videos.

Also, I kinda wonder - what other niches they may be doing this in? TV trailers may be only one of many such niches they target ...