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This phrase: "responsible for so many deaths" is doing a lot of work in your post. What is your theory of responsibility? Is it legal or ethical, and if it is the latter (as I would suspect), what framework and criteria is it evaluated under? The answer is easy for a serial killer (obviously responsible for willful murder), a little more difficult for a soldier in war (directly responsible, but perhaps defending them…
You can look up the definition of the word "responsibility" to clarify what it means.
You can complement that understanding with the understanding of what are the most basic responsibilities of a CEO, and all the reports about how this specific insurance company implemented official policies to automatically reject access to medical treatment that those who trusted their healthcare provider would desperately need.