I think it’s designed to make no sense —
It’s about sending a message:
1) We can blatantly murder you in a grisly way.
2) We will hang your body in the open, as a sign to others that we are not to be crossed.
3) And we are so powerful that we can have it declared a suicide.
4) We sleep well at night. Do you?
I can see the smirk on Slick's face at this.