It's about two competing objectives. One is how much you value your own life. The other is how much you trust everyone else.
If you have very high trust, then you're probably going to vote vote to a higher threshold, because you believe that other people will have the same degree of trust as you - they'll trust you to act to save their lives in the same way that you trust them to act to save your life. If you have low trust in random strangers across the globe, a 50% gamble is less attractive... but perhaps a 35% gamble is tolerable.
If you value your own life very highly, then risking it when it's avoidable is likely to change the equation. If you don't value your life very highly (some have stated they're old and willing to take the risk because of that), you end up somewhere else.
I continue to be appalled at your framing. You're not going to successfully shame me into thinking that valuing my own life, and not being willing to risk it when it's completely and entirely avoidable is a bad thing, or that I'm selfish for not being willing to gamble my death on
even odds.