Who said "I have to kill them to survive."?

This quote is attributed to Rick Deckard.

I have to kill them to survive. - Rick Deckard

"I have to kill them to survive."

Rick Deckard

Character in Do Androids Dream of Electric Sheep?

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"It can't last."

"I'm not a replicant. I'm a human being."

"Kill them before they kill you."

"What is human? What separates us from machines?"