I think you place too much emphasis on the symbolism of the capitol building. There was far less damage done to the Capitol (fortunately) than was done in the streets during BLM riots.
And, the police killed an unarmed woman -- no outrage for that?
And, the police killed an unarmed woman -- no outrage for that?
At some point, an element of “what did they think would or should happen?” has to be considered.
It seems that usually when those things happen, however, that itself is cause for riots.