It could be that it's legal to kill your clone if it's made without your consent. Riker and Pulaski were arguably raped, while Ibudan cloned himself.
Agreed. Riker and Pulaski were violated. Their DNA was taken from them without permission. Worse, it was taken after they said no TWICE. It was their genetic material, and it was their right to vaporize it. They were not fully formed yet. Not murder in the least.
Ibudan cloned himself for the express purpose of killing him to frame Odo. THAT was murder simply because it was already fully grown and sentient. Premeditated, actually, because he planned to kill him.