Whats the difference between a group of people tresspassing the capitol versus a group of people attempting to overthrow the government? Can your explanation be falsifiable?
Given that it was done as part of a protest against the election results, and at the perceived direction of somebody trying to keep their office, I think a jury could make a reasonable interpretation.
What exactly do you think would have happened to the Congresspeople had they this mob encountered them? The mob sure looked prepared to take some of them into "custody." And some of them clearly had no qualms with beating that Capitol Police officer to death.
Clearly Congresspeople, regardless of party affiliation, were not interested in finding out.
When it was immediately preceded by a rally in which an ousted president ranted about how the election was stolen and they should march on the Capitol and prevent the election results from being certified.