The fact that you used this phrase when it nakedly exposes reasoning that is a direct, obvious violation of expected utility maximization...

What I meant to say by using that phrase is that I cannot expect, given my current knowledge, to get the promised utility payoff that would justifiy to make the SIAI a prime priority. I'm donating to the SIAI but also spend considerable amounts of resource to maximizing utility in the present. Enjoying life, so to say, is therefore a safety net given that my inability to judge the probability of a positive payoff will be answered negative in future.

...until it no longer seems at all plausible to you that citing Charles Stross's disbelief is a good argument for remaining as a bystander...

I believe hard-SF authors certainly know a lot more than I do, so far, about related topics. I could have picked Greg Egan. That's besides the point though, it's not just Stross or Egan but everyone versus you and some unknown followers. What about the other Bayesians out there? Are they simply not as literate as you in the maths or maybe somehow teach but not use their own methods of reasoning and decision making?