Denial is a private psychological defense mechanism against uncomfortable truth. (realclimate.org)
Compartmentalization is an unconscious psychological defense mechanism used to avoid cognitive dissonance, or the mental discomfort and anxiety caused by a person's having conflicting values, cognitions, emotions, beliefs, etc. within themselves. (religion.blogs.cnn.com)
You should know that we human beings have mastered the ability to create our own psychological defense -LSB-...] (thebronxchronicle.com)