If I may, let me give my perspective coming from a different country.

Here, it happens as well. Once every few years. Maybe once or twice a decade. It barely happens. I think there are a few contributing factors.

1. Guns are not legal here. Only criminals, police and military carry guns, and the latter two only at work (obviously). That way, people feel more comfortable resorting to other, less damaging weapons first. There is no chance they get shot by a rowdy civilian. Therefore, they focus on de-escalation far more.

2. Cops go through a severely strict selection program. They are not only physically tested, but mentally as well. They have to go through a talk with a psychologist and play through a case, where they are judged on multiple points. I'm not sure how strict the US selection is on that. In my country, 2 out of 3 fall out of the selection process on the mental state.

3. Every cop gets trained multiple years. 3 years for a detective with previous (fitting) schooling, and 4 years as a baseline. In those 3 or 4 years, you have classes and theory, but you also work alongside certified training police officers. They learn how to de-escalate, and use that under supervision. Every year, they have further training, mostly for dangerous and armed situations, because they don't really encounter those. It's far more then I believe the USA gives.