[miguelrochefort]

> We have to throw out the idea of property, the concept of theft and so on.

Of course.

> Is murder even wrong in this context?

Murder is not wrong. Murder is just an action that reflects a decision. Whether it's good or not depends entirely on whether the outcome is optimal or not. Murder is not qualitatively different from, say, breaking a window. The only difference is one of quantity and scale. Generally, much more time and energy is invested in a living person than in the creation and installation of a window.