I think the point about evidence of deaths is quite salient, but what form would this evidence look like?
No insurance company would make a decision in such a way that they would be liable for harm resulting from that decision. Ergo, it is structured from the get-go that the responsibility to get and pay for care is on the patient, not the insurer. What that means is that in legal terms, there can never be proof that an insurance company’s decision is the proximate cause of a death.
So that type of evidence is ruled out a priori. We do have evidence that insurance companies’ decisions cause financial hardship. We also have evidence that people make health decisions in part on finances (especially avoiding care due to lack of means).
Given the nature of the insurance business and health regulations, how could one prove the insurance companies’ culpability beyond what is already accepted?
I opine that the decision to make care difficult to access, through a combination of cost, obfuscation (who is in my network? How much will kidney surgery cost me out of pocket?), and denial of treatment, effectively removes treatment from a large number of people. A subset of these people will experience harmful outcomes; a subset of that will be death.
It seems vanishingly unlikely that the number of deaths is zero. It remains to be seen whether it’s in the tens, hundreds, or thousands.
There’s also the factor that they’re never going to be the sole cause. Insurance companies may be a cancer, but they do not cause cancer (as far as I know). So someone dying of cancer is killed by cancer, as is presumably recorded on the death certificate; I don’t know how you could reliably document a case of someone who dies of a sometimes fatal disease, except in cases where they are denied access to ALL care, not just some of it.
So I hear your call for numbers and evidence, but the reason no one is providing those is because they are damnably difficult to extricate reliably, not because they do not exist.