Just regular prejudice will do — it doesn’t need to be extreme. Reminds me of a line in A Few Good Men:
"I strenuously object,” is that how it works? Hmm? Objection! Overruled. No, no, I strenuously object! Oh, you strenuously object? — then I'll take some time and reconsider.
There’s no such thing as “with extreme prejudice”..it’s “with prejudice”.
Extreme prejudice is what these perps deserve.