I don't think the intent was to use the video as a vehicle to make some political point, since he hasn't for any of his other videos. So I think this one had what you mention just as a ass-cover to preempt any anybody getting overly sensitive and trying to accuse him of making the opposite sort of political point.

It's not like he ends with a lecture to educate people about what happened, he just makes it known with brief and general language that he's knows some bad shit happened and he's not glorifying those acts. Somebody who was clueless about all of it would more or less remain so; it's a message directed towards people who are already familiar with the subject and might conceivably be offended by his video if he didn't include the end bit.