15-26 million people participated in the protests in the US last summer. The 1-2 billion in damage[1] is a shocking number taken on it's face, but if 20 million people poured into the street with the intention of causing damage, they would cause orders of magnitude more damage than that. Adjusted for inflation, the 1992 Rodney King riots in LA caused 1.4 billion in damage[2].
The main demonstration in my city last year, which I attended and attracted thousands of people, were totally peaceful in vibe. A group of people burned a bank down in the evening, but it was a totally different group that formed hours after the main BLM march and was 20 miles away.
[1] https://en.wikipedia.org/wiki/George_Floyd_protests
[2] https://www.chicagotribune.com/chi-insurance-civil-unrest-ri...