Cops can use force to stop a crime, over come resistance, and for sure to prevent their weapon from being taken...but do we want them to use force, as in beating a suspect when they decided he needs to be punished?
Yes. This big guy, is no stranger to encounters with law enforcement. If he is "stupid" enough to go to grappling with an officer, and try to take his weapon, the Po-Po have no idea what to expect....So they use whatever force is necessary whether he flees or not.
That's why for hundreds of years, LEO's from all over the world carry nightsticks, shellelagh's, blackjacks, batons, over in Asia it's big long bamboo sticks and canes for attitude adjustments as needed....
Scrap with cops, try to take his gun,....certainly this genius of modern society chose the "hard" way...
Perhaps next time, after he gets out AGAIN....he'll comply with an officers commands and do it the "easy" way...