Really? You sound serious. I would recommend rethinking such a claim. There are simpler and more plausible explanations for why people view existential risk differently.
What are those? Because the risk is far higher if you believe that "will" is fundamentally materialist in nature. Those of us who do not (for whatever reason), do not evaluate this risk remotely as highly.
It is difficult to prove an irrational thing with rationality. How do we know that you and I see the same color orange (this is the concept of https://en.wikipedia.org/wiki/Qualia)? Measuring the wavelength entering our eyes is insufficient.
This is going to end up being an infinitely long HN discussion because it's 1) unsolvable without more data 2) infinitely interesting to any intellectual /shrug
