The issue is how to program a decision theory (or meta-decision theory, perhaps) that doesn't fall victim to Pascal's mugging and similar scenarios, not to show that humans mostly don't fall victim to it.
However, it's probably worth figuring out what processes people use which cause them to not be very vulnerable to Pascal's Mugging.
Or is it just that people aren't vulnerable to Pascal's Mugging unless they're mentally set up for it? People will sometimes give up large amounts of personal value to prevent small or dubious amounts of damage if their religion or government tells them to.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.