I don't think that you're going to find a lot of "notations of people dying due to insurance claim denial" for several reasons, one of them being that not many people want to, or are able to, go to court against an insurance company's sharks who are on retainer for millions, for defamation. Etc. (Also, it doesn't have to happen that a company denies a life-saving drug and the patient dies a month later, directly due to not having the drug. The point is, very, very, many people have their lives wrecked by delays and denials in the insurance industry. In my book, your doctor -the person who is actually educated and trained to provide medical care, isn't the one giving it- it's the CEO of abcinsurer who got an MBA at Harvard, and the others in the pharmaceutical-insurance-federal complex.)
These companies are hugely powerful and profit-driven. I recently read here about someone seeing "hundreds" of complaints online about UNC. Hundreds? Millions would likely be more accurate. The hatred people feel at these ginormous insurance companies is palpable. And UHC is on the top of the heap for being the target of it. (With good reason, IMO.)
Another person here pointed out how awful it is to rage at the poor employee on the other end of the phone and it is. But, WHO does one rage at? Do you think Brian Thompson is going to answer the phone? Can you talk to a live person and get any individually-oriented response to your individual problem at your insurance company? I can't. I'm lucky if the Chat-bot isn't too busy to take my call.
All of this is to say that no one should have gunned down Mr. Thompson on the street. However, there is rage. Absolute rage, and rightly so, at the handful of elites who control the lives of tiny, powerless, often elderly and sick people, all the while ensconced in their cushy lives, with their millions and billions.