No sane or rational person could ever condemn political violence.
That would mean we should not have rebelled from England, and we could still have feudalism and slavery.
The only real question is when is political violence justified?
And obviously is you are one of the thousands of Blacks murdered illegally by police. then it clearly has been more than justified ever since Blacks were brought to this country against their will.
I am not Blacks, but there are infinite reasons political violence is justified in the US.
For example, we lied about Iraqi WMD and illegally murdered hundreds of thousands of innocent Iraqi civilians with Shock and Awe, that deliberately targeted civilian infrastructure, causing death by lack of clean water, starvation, and lack of air conditioning.