So, him saying "I can't breathe" while actively resisting being subdued is reason to just go "welp, let him go guys!". No. It is unfortunate what happened, however, police have to subdue the suspect before rendering medical attention or adhering to pleas of anything. This death was accidental. The cop didn't intend to crush his windpipe or do anything other than subdue the suspect safely.
Do you believe that if suspect is resisting arrest and tells a cop "don't tase me, I have a heart condition", but continues to resist, is tased, and dies is an accident?
Cops, at least military cops, are specifically trained to wait until after they have subdued the suspects before rendering aid. This is especially true when you pepper spray a suspect. They will often cry they can't breathe, when in reality, they are simply panicking.
The take down compressing the neck was the primary cause of death, but additional factors included his obesity and heart problems. The EMTs who did not render aid were suspended without pay, but I don't know for how long and if anything else came of it.