I always felt like murderous clones are a bit different from evil twins.

From a sci-fi perspective, I’ve noticed that murderous clone stories tend to explore the following themes:

• Whose life is more valid? Does an original have any more right to life than the clone? What aspects of life can never be split between two people with equal claim?
• Would the murder ever matter, in the grand scheme of things? As far as society can tell, the world is exactly the same before you are cloned and after one of you kills the other.
• Could the survivor ever be brought to justice? If the clone tried to kill you because they knew you would try to kill them, does that make it self defence or premeditated murder? Would any punishment would be a net loss for society, when compared before the clone appeared?
• Could this “self destructive” impulse hide deeply inside even the nicest person? How much does a person love themselves? Can self-love even apply when the “self” is also external?