If you are feeling sad and hopeless that is completely understandable, but it's also a luxury we can't afford right now. Here's a list of some great organisations helping on the ground, just as a handy guide:
"I mistook my taser for my gun" is really a striking endorsement of not giving patrol officers guns in the first place. I mean, if your pharmacist couldn't tell an aspirin from fentanyl, it's not just something you accept as a occupational hazard.