He didn’t per se instigate but he added fuel to the fire and that was the last straw. Unlike leftists, I condemn all riots, looting and vandalism. Including that of BLM this summer in Portland, NYC, Kenosha, Minny and Seattle. I also blame the media for dividing the country in order to garner ratings and eyes.
If you think that BLM was about "the media", then I have to just conclude you don't know many black people personally.
It wasn't just about the handful of questionable shootings of black people. The police shoot hundreds of black people every year, and MOST of them don't get that much attention. He came at the cop with a gun, no one feels bad.
It was about the experience of being black in this society, where being pulled over for a DWB or being racially profiled is a normal thing. It's about the woman who had her door kicked in because the police had the wrong address on a warrant. That's the reality of being black in this country, you and I never experience it.
Final point. Of course Trump instigated this. He's been instigating this since before the election, telling his followers that if he lost, it would be because of fraud.