It's because he's right next to the car. She starts to drive away and he steeps to the side as he shoots. At no point was his life even remotely in danger, all she was trying to do was drive away, and he shot her because he didn't want her to leave.
I don't know if anybody else remembers, but some years back an armed group of chuds occupied (and wrecked) a wildlife refuge here in Oregon. One of the guys eventually tried to flee, and when the cops cornered him down the road, he tried to pull a gun. I distinctly recall people at the time arguing that guy _shouldn't_ have been killed, it was excessive force, etc etc. Point is, there, as now, the issue for reactionary, mouth breathing, power entitled bullies isn't what happens, but who it happens to. "She wouldn't have died if she wasn't anti-ICE and tried to block a road." yeah let's just unpack that one lol.