And all I’m hearing is revenge and regret
One useless emotion and the other leads to death

from Murs (Ft. 9th Wonder) – Funeral For A Killer Lyrics on Rap Genius

Meaning

Revenge is a vicious cycle that never ends which in gang affiliation almost certainly leads to death. The other emotion — regret — is a useless emotion in their minds because it doesn’t help or satisfy anyone.

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