Every ethicical framework has issues at the edges. Whether they be based in categorical imperatives or utilitarianism.

> utilitarianism (ethics come from the outcome) is the better option.

Is murder ethical then, if the murderer uses the victim's organs to save the lives of 10 other people?

You always have to watch out for the edge cases lest you get cut.

At the end of the day, all ethics is rooted in selfishness. The weighing of what we want to happen to us, what we want to do to others and what we don't want to happen to us. There is no universal or natural or absolute ethical framework. It's just a human invention born out of human selfishness.