> In the unarmed scenario, you need two trained police officers. Two people, well-trained and with good teamwork, can usually restrain even a huge, out-of-control person.

This simply is not true. There are plenty of videos out there showing one out of control person fighting off more than two cops. I used to work in a busy hospital ER on a military base, and the military police would frequently bring in drunks they arrested. On a regular basis, it would take four military police plus me and maybe another medic (if they were available) to properly restrain people. Some would fight so fiercely that they were at great risk of harming themselves, and controlling this was often the biggest part of the problem. You can't just sit on them, you have to subdue them properly. If someone is threatening your life you can choose to use deadly force in self-defense, but if not then you have to restrain them, and this takes a lot of work. Put two 'well trained' cops against one determined drunk or druggie, and you get three injured people. This is not a trivial problem.