Stop lying. Babbitt did have a para force folding knife in her back pocket. And the police had just been informed of the pipe bombs placed outside the DNC offices, so were aware there might be more weapons.
Babbitt was definitely warned, but I doubt with all those drugs pulsing through her system she could understand normal warnings.
The three armed officers standing between Babbitt and the door were threatened into fleeing, leaving Babbitt and the rest of the rioters to attack the door. Had Babbitt gotten through the door, as she was trying, there would be nothing between her and members of Congress.
I have an idea: try breaking down a door at the White House, and see what happens. I doubt you would even make it to a door before a Secret Service sharpshooter puts you down.
Her hands were empty because she was trying to get through the window in the door. The weapon was in her back pocket. It was impossible for the officers to know what other weapons were being carried. She was given multiple warnings.
Again, there was a weapon on her. Because most of the other rioters got away, it is impossible to know how many others also had weapons.