[georgekv]

[Rational] ignorance [can be a qualified] bliss.

[wr1472]

There you go again, trying to make everyone more informed.

Stop it.

[Klinky]

One person's rational is another person's irrational.

[pjscott]

In perception, yes, but not in reality. If you want to be alive tomorrow, jumping off a tall building will be irrational even if you think it's the last step in a convoluted ritual to grant yourself immortality. That's an exaggerated example, but the principle holds in general: people's desires may differ, but the rationality of any actions taken in the pursuit of those desires is something you can evaluate objectively, at least in principle.