In order for you to sedate someone, they must already be under control right? Or do you jump into the dog pile with a syringe full of ketamine?
Furthermore, you’re unlikely to have been there for the initial encounter so who are you to judge whether someone is trying to hurt police versus someone who is being assaulted by the police after having committed no crime and is only trying to protect themselves from a bunch of roided-out criminals? These fights often involve police kneeling on people’s arms and legs, immobilizing them completely, while shouting “give me your hands” or “stop resisting” so that it appears to bystanders that it’s a two-way fight and not just a motionless person getting the shit beat out of them. I can’t count the number of bodycam videos I’ve seen where you can clearly see the ‘suspect’s’ hands pinned down by other police while being punched in the face for not putting their hands behind their back.