Because it is very important:
For all have sinned and fall short of the glory of God. ~Romans 3:23
Not just your neighbor or the person you don't like. But, you. You have also sinned and fallen short of the glory of God. You are no better or worse than anyone else in this regard. You are not even better than the man who has sinned and is not saved. By grace, you will not die in your sins and by grace, he may still be saved before he dies.
Well I know I'm better than some child molestor. I'm better than some murderer. I'm better than a thief. I'm better than all of those that falsely accused Terry Schiavo's husband of awful things (isn't falsely accusations a big sin?), I'm much better than any of those types. Please file that under "Reality Check"!
Actually, in the eyes of God you are not. That is reality. What you are talking about is merely your perception, but it is not truth.