Sin Is Irrational

Hmm, hot on the heals of yesterday's post, we have some more data to ruin a rationalist's day.

Quote of the day:

"The more elaborate ethical debates that we engage in are largely attempts at post-hoc rationalizations of our earlier decisions. "

Now, if this can happen in a clear cut economic sense, how can the rationalist be sure it's not happening every day, in every way?