"Of course I am.
In the time until you figure out immortality, how many would die? I can find people worth three of Yellow. I could probably even do it by choosing at random. If the same were true of me and killing three like me would let you save one of them, then I would be able to understand why you might want to kill me for it.

Please do keep in mind, I'm already kind of immortal. I'm not just motivated by selfishness here."