To me, the answer to that question is both.
I am deeply disturbed when the overwhelming reaction to a man being shot down in cold blood in broad daylight is "he deserved it." To be up front, I am against the death penalty in all cases. I certainly believe the man and his company are unethical in their practices and guilty of negligence in the death of many, many patients, but I'm not going to go on a political rant about about the mess that is the health care system.
I'm just going to say taking a life only escalates the violence. I don't think this action will fix anything, and it certainly won't bring back anyone who died as the result of unethical choices by an medical insurance company. The loss of any life that could be saved is horrible.