As far as the false suspicion of wireheading, I am not sure about the attitudes here, but isn't it just a value? I mean I don't think I am interested in wireheading, but if someone truly thinks it's for them, why would we condemn? I thought the forum is about being rational, not about a specific set of values.

Your point is valid.

Where it does make sense to call another's choice to wirehead a mistake (rather than just a difference in values) is when that person thinks that wireheading is what they want but they are actually mistaken about their own values or how to achieve them.

It is a little counterintuitive but even though values are entirely subjective people are actually not the absolute authority on what their subjective preferences are. Subjective preferences are objective facts in as much as they are represented by the physical state of the universe (particularly that part of the universe that is the person's head). People's beliefs about that part of the universe and the implications thereof can (and often are) wrong. This particularly applies to abstract concepts - we aren't very good at wiring up our abstract beliefs with rest of our desires.