As a police officer for 14 years and a defensive tactics and use of force instructor, I should explain a thing or two about how police do that and why we are successful. 1) We use weapons.......we have Tasers, OC Spray, Batons. 2) Most folks don't really want to fight the police, because they know they will go to jail longer, and we also have guns. 3) We usually have superior numbers. And even with those advantages, sometimes it still comes down to nearly beating a suspect in to submission, when they are truly motivated to fight. There are some tough folks out there, and not all of them are nice.