When we do that, deep down we know that we are wrong. Or, speak out your rationalizations, as if you were dealing with someone else's situation, not your own. Look inside yourself, pause for a moment, introspect. You'll be able to hear better if you actually ask yourself aloud. Being trustworthy is an important factor in self-esteem.
Conscience is a powerful drive.
It keeps us honest and walking the straight path. Don't squelch it. Listen to your conscience and let it help you to get the job done. After you've reached any decision, pause. If you've chosen correctly, you'll find yourself feeling a thrill of pleasure.