is it cruel and unusual punishment to kill someone for blocking traffic, remembering that they also could be blocking emergency services and halting commerce, putting people's lives and livelihoods at stake, after everything else they've tried doesn't work?
Yes, because you can still forcefully throw people into police vans without opening fire on them. Plus, we don't execute people for making fake 911 calls, even though those waste the time of EMS crews. The only reason people here are so gung-ho about supporting this nonsense is because they think they'll get to watch BLM protestors get shot to death.
Also, you aren't going to be 'getting people to the hospital faster' by littering the highway with corpses. After police open fire on criminals, the entire area gets locked down.