The madman is not the man who has lost his reason. The madman is the man who has lost everything BUT his reason.
G.K. Chesterson
Continuing our thought from the previous post. A person has the capacity to justify ANYTHING. Even the Nazi's ym"sh claimed that they were cleansing the world of vermin [i.e. the Jews]. Regular people justify their own [albeit less extreme] behavior.
That is why one MUST learn mussar and be constantly vigilant to make sure that his behavior is in line with the will of Hashem.
PS - Please daven for Chaya Mushka Bas Gila Elka! Thank you.