I know I will be villified by the LAPD and the media. Unfortunately, this is a necessary evil that I do not enjoy but must partake and complete for substantial change to occur within the LAPD and reclaim my name.

from Christopher Dorner – Manifesto on Rap Genius

Meaning

He’s well aware that he will go down in history as a cop-killer and a overall crazy and evil man, and that’s what most people will see him as, but he feels he’s doing what must be done in order to expose the corrupt nature of the LAPD, which has gained a national, even international reputation for being corrupt from the patrol officers up to commanding positions.

(Think Bane from The Dark Knight Rises)

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