A coup? The USA government know something about coups as they orchestrate them across the globe and the body count does be very very far from one cop. If they really were attempting a coup everyone of them cops would be waisted. They were just a bunch of stupid bigoted protesters ignorantly questioning the validity of an election that occupied some buildings for selfy opportunities.
Well, you'll get no support for CIA sponsored coups from me; but we're dealing with the same issue - violent insurrection with the purpose of installing a dictator and crushing democracy.
They're not protestors. Go and look at the armed militia element to that crowd and the political statement's on many of their flags and banners.
That was an attemped putsch.
The only way to deal with it is by imprisoning hundreds if not thousands for life, and if some resist arrest then you use the opportunity to annihilate them and send down a powerful message to would be seditionists in the future. Basically: put their heads on a pike staff outside the castle gates.