We finish talking about the basic instincts with a discussion of the sex fear as it relates to self will. Then we need to see how we are when we live a self centered life. The fourth step give us a chance to see how our selfishness caused us to behave mad, or scared or hurtful towards others.
We work the 4th step because we need to make some sort of inventory of what we have done. Then we can review this will help us to remove those defects of character. This clearing out the old and makes room for so new, better thoughts and goals.
Oops, actual quote is: `Bury the dead, they stink up the place`