It was unauthorized and excessive in its force. The guy was barely resisting arrest, the officer choked him out, officer drove his knee into his head. At what point has the guy stopped putting up a resistance? The guy said "I can't breathe" at least half a dozen times. The officers wasted crucial time sitting on their hands when they should have been tending to or getting medical help for an unconscious man.
Incapacitate him, okay. But Pantaleo totally lost control of himself.
People say Garner's obesity contributed to his death. If he's so obese why then the need to maintain and firm a chokehold after he's already been neutralized? The guy wasn't a threat.
I think regardless of Garner's arrest record, if it was my family member or one of your family members we would rightfully be royally pissed off.