It's not a civil war for the same reason its not a coup for the same reason police are not using force against them: they do not represent a serious threat to the American state, they are on its side.
Its a spectacle, the results are pre determined. They're chained up in a cave pointing at shadows on the wall. If it was this easy to meaningfully threaten the American state I would be embarrassed for the American left for not at least trying it.
People seem to think that a political spectacle cannot involve any violence and I would respond that typically political spectacle actually leads to violence. not violence that meaningfully threatens the system, mind you, but one that is seemingly aimed at random.
The violence is aimed at seemingly nonsensical targets with no material basis. theyre unable to develop a coherent plan. Whats their goal? pressure the government into making trump president? declare a dictatorship with Trump as head? how could they ever feasibly have done these?
A weapon that is aimed at random with no coherent target is still dangerous insofar as it can still cause people harm, it just cannot overthrow a government.