Recently I watched in TV how police in different towns evacuated protesters from parks, and sometimes it was needed up to 5 police officers to pin and transport one protester (who of course didn't want to gladly cooperate)
I don't have a very deep understanding of this but it's such an interesting discussion I'll join anyway
I haven't worked as a police officer, but I wonder if it's partly because they will be blamed if they injure people, and people under arrest even when pinned often keep struggling against the pins in ways that will easily injure themselves? Either because the person arrested consciously decides they are willing to get injured, or because (from lack of experience or from adrenaline) they don't realize they're going to be injured, or because they are in a kind of animalistic state of mind where they respond to pain or to being 'trapped' by fighting harder?
With more police it looks like they can overwhelm them so entirely that they can't even move enough to struggle.
So I don't know, if my theory is right, does that mean if the police weren't concerned about injury, does that mean the people could get away if there were fewer officers? Or does it 'just' mean that they would likely end up injured but they still couldn't escape? Or maybe even one police officer could do it safely most of the time, but not 100% of the time, and there's no reason not be more sure and add more police since they're there?
Or is it because a person being arrested usually doesn't give a committed attack
(half joking, but maybe not entirely - it does sees different to try to pin someone who's just standing there).