Chicago PD. There are 2 police officers in the scene, talking about a potential buy-bust, they are going to catch a gang dirty selling some sub-machine guns or Uzi in this case.
A black guy is going undercover. His dialogue:
I'm fronting as a big dog of the 88th Street Vipers. My vibe is he likes selling to brothers because he feels like we're just going to wipe each other out, help his cause anyway. We got a get-to-know-you offer for five Uzis on the table. The meeting's in two hours, and I can't wait.
In this dialogue what does he mean by my vibe is?
In addition, I could not understand this phrase help his cause anyway.