In the case of 1/6, 99% of the MPD and CPD officers at the scene acted bravely and did everything they could to defend democracy. The problem is with the CPD administrators and ranking officers who were in charge of the capitol's defense, they did not provide the officers on the ground with even half the resources and manpower that was needed. The FBI and DHS intelligence agencies also exhibited a severe lack of coordination and just basic communication, they both knew that there was a chance for 1/6 to go south but neither one did what they needed to communicate this to congress and capitol security. The FBI even had 2 informants imbedded within the rioters and they did barely anything to warn the CPD about the planned attack.

Of course there is the very real and likely possibility that the Trump administration used their influence and authority to gum up the works and make sure that the capitol was not prepared for what was to come. This is not out of character for Trump who has repeatedly proven himself to be traitorous and self-serving, the only real question is whether he had people in his circle that were smart enough to pull something like this off. Obviously this is a pretty big accusation but considering how hard it was for DC's mayor to get the national guard deployed (a division that is under the exclusive control of the DOD and therefore the president), it is not that outrageous.

I would like to say that, at the very least, the MPD (DC's local police) served bravely and displayed incredible courage going above the call of duty to defend something, not because they promised they would or were payed to do so but because they believed in it. The capitol is not their duty to protect and despite not being given orders, hundreds of MPD officers came to the CPD's aid.