Here's something to think about.
Rational behavior is flawed as it is coming from an irrational source.
Is there a way to be solely rational. To reject the irrationality of the human mind and act purely through logic?
I'll leave that up to you, I'd like to see what you come up with.

The underlying problem is that a human at some point must make an irrational assumption to be rational. For instance, we choose whether something is irrational based on ethical and moral axioms that were by the same standards "irrationally" assumed. Rationality could be in a seemingly paradoxical way considered an illusion that justifies (to yourself) our irrational nature through the contradiction of itself! (That one's quite hard to explain)
As another little challenge, I would love to hear an example that contradicts my previous statement.