It's not that they can't change, they don't want to. They lack the empathy, sympathy and compassion to change for "The better" just because it's better. The parts of their brain that allow such action are essentially non-functional. If a killer ever personally wanted to stop, for instance they just got tired of the cleanup afterwards, or they for some reason get bored of killing, then they could very well quit without a second thought and look for something else more pleasing and stick with that until they sick of that too.
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"Let's also tell the assassins who we are so they know who to kill"
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