The lady that was shot was attempting to enter a hallway through a window while people in the hallway were pointing guns at her. Just because she didn't have a visible weapon doesn't mean she wasn't a threat. Climbing through a broken window into a hallway protected by a makeshift barricade is itself a threatening action. No one at the head of a mob climbing over a barricade ever did so for innocent and non-threatening reasons. Suggesting otherwise is ludicrously stupid.

Having seen multiple videos of the event it's clear the shooter was not firing wildly into the crowd. They were aiming specifically at the person trying to break into the area. She's dead because of her own actions.

Note that she was wearing a good sized backpack. The shooter was wearing plainclothes- possibly Secret Service. It appears he was protecting something or someone important. Pence?

Pence would not have been in the House Lobby area, he would've been taken directly from the Senate to a secure area.

Let's step back to before this happened. Why did the Capitol Police let people in:

https://twitter.com/i/status/1347615998610911234

You're not a protester if you are breaking into congress, breaking past a barricade, being told to stop, and walking towards an officer pointing his gun at you. You're suicidal.

But, they let these people in:

https://twitter.com/i/status/1347615998610911234

Should've shot them too if they refused to back down