I really don't think there would be all this discussion and legal controversy if Guyger hadn't been a cop. I don't know why exactly I think that, but I do. I'm just trying to imagine the scenario with a non-cop.
Amber is a bartender. She just worked a double shift, and it was a stressful one. She's very tired. Amber also has a concealed carry permit, and tends to carry her weapon with her when going home alone late at night. Because she is so tired, Amber accidentally walks into the wrong apartment upon arriving at her building. Believing the resident inside to be an intruder, she panics, draws her weapon, and shoots him.
Would anyone be defending Amber the bartender? I could be wrong, but I honestly don't think so. Amber the bartender would have gone straight to jail that night, and people would be calling her an idiot and chanting string her up.
ETA - My point being, Amber the bartender actually has more of an excuse to panic and be an idiot, if you think about it. She's a civilian, not trained to deal with these kinds of high-pressure situations at all. She carries the gun because she's afraid, on some level. So when panic-time arrives, untrained and unprepared Amber just starts shooting. But a ******* cop should know better. Yet Amber the bartender wouldn't have inspired so much lively discussion. Maybe a 3-4 page thread joking about her idiocy, speculating that she was drunk/high, and decrying the problems with citizens going around armed. That'd be about it.
Sorry if this was "fan fiction," but it's just what I think.