Earlier quoted context omitted.
If you’re talking about really low probability deaths then you need to consider really unusual cases. Fires gun at fleeing suspect, bullet hits _ -> deaths. Now, how does _ end up with 10 million deaths? Well, the US Air Force for example has accidently dropped nuclear warheads on several occasions. They are designed to be really tough, but there is probably a non-zero chance a bullet could end up setting a defective…
But it's far, far higher chance that terrorists would kill 10 million tomorrow than police. All it takes is for a terrorist group to get their hands on nukes.
China, US, India, Pakistan, Russia.....