Hmm. Well, true for me too. I wouldn't endorse it per-se either, especially not in an ideal world with an ideal mind.

However, considering limited mental resources, limited willpower and constant internal competition for the conscious mind's attentions, I believe that this kind of behavior is instrumentally rational considering that it works when you have a good idea of when automatic behavior produces better results and, more importantly, all the much more likely times where it doesn't.