“[…] Out of the heart come wicked reasonings […].”
~Matthew 15:19

Do I ever try to justify unethical behavior to myself when tempted to do something wrong?
It is human nature to have a sinful inclination, but if I am not careful, I could end up a slave to my own whims, and also end up hurting those who matter most, including God. (Jer. 17:9)
Instead of entertaining sinful notions, it is wiser to not let them nest in my heart to begin with. (Prov. 4:23)