The question is why can I delegate something that I don't have the right to do. If I have the right to stop the drunk driver, the answer to the question is that I do I have the right to do the things I'm delegating.

Why does it become acceptable? Because if delegation of something you have the right do is unacceptable, pretty much everything breaks down. That is, Satya Nadella needs to stop hiring people to write software and do it all himself.