There have been a lot of memes made on this quote by Batman, but where or when did he say this line?
If you kill a killer, the number of killers in the world remains the same.
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It looks like this quote is falsely attributed to Batman. It is also attributed to Winston Churchill, but there is no hard evidence, that I can find, that either one said this.
It appears someone at some point used a picture of Batman and stuck the quote in front of it. (At least that's what one guy blogged).