The acts themselves, even the violent ones you conveniently omit, weren’t by themselves a threat to democracy. It’s what those acts were intended to prevent, i.e. peaceful transfer of power.
The acts were not really a threat to peaceful transfer of power. They did not occupy Capitol Hill for weeks with armed force, like #BLM/Antifa did with Capitol Hill in Seattle. They did not occupy Lafayette Square for over a year like #BLM/Antifa did in Minneapolis with so-called "George Floyd Square". They did not murder an 8 year old girl, like #BLM did in Atlanta. They did not even burn down any buildings and vehicles, like #BLM/Antifa did throughout the US.
It was a nothingburger riotlett. Mostly trespassing, some broken windows. No worse than what has been done at Columbia, and yet the left-wing Manhattan DA dismissed the charges against them.