I appreciate the Devil's Advocacy. The simple issue, though, is that if you use a definition of "rational" that encompasses this behaviour, you've watered the word down to oblivion. If the behaviour I described is rational, then, "People who act always act rationally," is essentially indistinguishable from, "People who act always act." It's generally best to avoid having a core concept with a definition so vacuous it can be neatly excised by Occam's Razor.