It was an occupation of one Government building for a couple of hours. If they had sat down, it would've been called a sit-in and we could all move on.
An insurrection is a violent uprising against an authority or Government. Oh, but people died. Sure, 5 people died; one of a stroke, one of a heart attack, one was shot by a scared capitol police officer, one that we don't know what happened, and Brian Sicknick who was not killed by a violent act (likely had a stroke) but for some reason the Government won't even tell the family the cause of death. But at the point that they were in the Capitol, other than there being a mass of people in some small spaces, they did not at any time kidnap, attack, maim, kill, or any other violent action to any member of the federal government. Mostly they walked around and took pictures. Thus a protest gone too far, a lot of criminal actions, something that shouldn't happen again, absolutely. But not an insurrection or a coup or any other overhyped term that you want to use. Nor was it an existential threat to Democracy.