If he died he wasn't choked for 10 seconds and you're also forgetting that these cops have shit for brains they won't necessarily know properly about the windpipe and jugular vein or that there are certain pressure points along the neck you can actually kill someone with so if you're actually pinning someone down with enough force yes you could kill them in 10 seconds if you're being a jackass and not watching what you're doing.
The video clearly shows they applied force on the neck for 10 seconds and then let go of that area.
Garner was just as much being a jackass for wildly throwing himself around and refusing arrest. Let's use this scenario, let's say a police officer tries to arrest a perp at the foot of a stairway, the perp resists, they tangle and wrestle around and fall down the stairs and the perp breaks his neck, is that the officer's fault?
Look i'm sympathetic to the police in this instance mainly because I have family who work in the medical industry. You won't believe how many idiots sue the hospital and the doctor because their 70 year-old 300 lb. grandmother goes in four a routine hip implant or something else and ends up dead on the operating table. Somehow it is the hospital's fault that their elderly overweight grandmother died, it is absurd. Unhealthy people die because they are unhealthy, not the actions of the world around them.
The same goes for this case, the police were no more "wild" with him than they could be with any other suspect but because the man was obese and probably near death as it is, it's a bit drastic to charge with murder because a normal healthy human being would have gotten up and dusted themselves off. Is it the job of the police now to evaluate a perpetrator's health before they decide to take action?