I was just watching a video of people in America looting a "target" store. I think the state is called Minneapolis?

I noticed 90% of the looters were African American (mostly), rest were white (1-2 of them). I am from a third world country and I know what poverty looks like. Those people did not look poor to me. They were dressed in mostly clean and new clothes and did not seem be the ones who were starving. They seemed healthy and well fed.

I thought America was a first world country with very less unemployment rate and poverty? Looked strange to me.

Why that certain group of people acting this way over there?