The Reason

Quit your sniveling!
You whimper and beg me to show mercy; you're missing the point entirely.
I'm not going to kill you because I have to, want to, or need to.
I'm killing you because I can.
There was no plot. There was no planning.
I didn't stalk you in that parking garage; I saw you, and realized that I could overpower you if I chose to.
So I did.
Pleading for restraint is pointless, so stop already.
You see this knife? Guess what I'm going to do with it.
You won't stop crying? Fine!
Your tongue comes out first.