You seem to be assuming that all the people involved were conspiring to cover things up and protect a cop. They knew riots would ensue if the cop wasn't charged, but I am glad they followed procedure and didn't push this forward despite a lack of evidence.
If the video of Eric Garner's homicide isn't enough evidence for an indictment, what is? Such an indictment wouldn't presuppose a guilty verdict after the case went to trial, but it would allow defense and prosecution to present all evidence in a public courtroom.
For the sake of argument, if the actions of police were intentionally meant to harm or kill Garner, which is what needed to be proven, just who should have been charged? The cop was acting under direction from his superior, who was present. Should both be convicted if it was intentional? Why does no one mention the black cop in charge of the scene? This fact keeps getting ignored. Can you address that or not?
Given his health, stress would play a huge role and being restrained no doubt causes a lot of stress. The narrative is that the cop literally strangled the man to death, but facts don't back it up. A person can die simply from asthma and a bad heart and becoming seriously agitated can be the final straw. The GJ had to look at evidence to determine whether it was intentional or whether the officers on scene had reason to believe that Garner was in mortal danger. Why does this confuse so many? Asking for murder charges when no murder was committed is just wrong.
Most people complain when restrained. Police often hear that they can't breathe when being held or that the cuffs are cutting off their circulation. Rarely is that the case, but people don't take well to being restrained against their will. If they didn't fight, it would go much differently. I would guess that the goal of many suspects is to talk police into letting up in hopes of finding a chance to run. If a person can talk, they can breathe. It's that simple. Why should police have believed him and why didn't he calm down? Simply telling them he was having an asthma attack would have alerted them to his medical problem, but that wasn't done. In the same way he yelled at them, he could have stopped struggling and told them to get his inhaler or take him to a hospital. It really can't be any clearer. It sucks what happened. I don't think sending that many cops to a guy selling cigarettes is warranted when there are violent crimes being committed in the city, but cops are under orders.
There is no evidence that the cops intended to harm, and certainly not to kill, Garner. That was the issue before the GJ. There could be a valid complaint against unnecessary force. Bottom line is that when you don't cooperate with police, they will use whatever force is needed to take you into custody. Using more force than needed should result in consequences for police, but in this case they were talking murder, which just didn't happen.