Most of the rioters, looters, and arsonists were black or whites who supported the Black Lives Matter Movement.
The last poll I saw in July was that 63% of Americans supported the Black Lives Matter movement, so Alan is saying that the rioters, looters, and arsonists came from a pool of somewhere in the neighborhood of 200,000,000 people. Sounds a lot like everyday Americans to me. I don't why he separated them into black and white. Well, actually I do.
Some black gangs came from other cities with the direct intent to loot only, then return quickly from where they came from.
It is the first time I have heard that comment. I would want to see some factual support for that statement before I made a judgment as to its veracity.
Viewers saw night after night of who was rioting on TV.
There was some variation in what you saw depending on which channel you were watching. The same is true of the commentary you heard.