Youth today are getting hit with all kinds of problems, such as the Covid virus problem which is creating high levels of unemployment for young people.
This situation alone is creating a lot of anxiety, strife, depression the list goes on.
They direct their grief toward the controlling governments as causing these problems , the Police abuse scenario just stoked that anger up even more.
Trump the white corporate elitist who is power right now may be another instigating factor.
The reason these protesting groups have been so violent and disrespectful to the police is because they see them as part of the problem.
The diversionary political ideologies within the US right now is the highest I've ever seen it. I can see this continuing on right up to the next general election.