He is guilty of using excessive force and very poor judgement which were "contributing" factors in the death of George Floyd. He's not guilty of murder, but is guilty of lesser charges such as assault and/or manslaughter.Under the law, other contributing factors to a death do not rule out criminal culpability if your actions also played a role in the death. This is criminal law 101. If Chauvin did not knee his neck and shoulders for 9 minutes the other factors would not have led to his death. Also you dont need to damage a trachea to choke someone out or you never seen MMA or studied martial arts. You just need to collapse the artery in the neck and prevent it from being unobstructed.
Riots will probably occur with anything less than a murder conviction and a public hanging.