The bad guy better hope I'm not on the jury. I only see one idiot here who drew yet another officer or officers into an unwinnable situation. Kill or be killed.
Have we perfected robo cop yet? That would be an officer who could just beat the crap out of these guys until they comply. No knee caping or tackling required.
Tackling a perp. That is stupid. It places the officers gun within reach of the perp while they are rolling on the ground. Many states have laws that view the perp as being armed and dangerous once he engages physically with an officer who has a gun in them, so no tackling wouldn't work. Plus, while you have the primary perp in a full Nelson, his budy decides to get in in the action. That is extremely dangerous for the officer.