Philosophizing abstractly about edge cases is fun but it doesn't really offer anything useful for day-to-day basic living. It's pretty clear that to a vanishingly small gap, murder is 100% evil.
It's true that it doesn't affect our day-to-day life. But I think it is important in the context of being an informed citizen (and, more fundamentally, an ethical person) to have an understanding of different moral systems and the philosophy of ethics. I recognize that this is a personal opinion though, so I won't try to force it on you.
Especially if those concepts are touted as being all-encompassing, holding without exception or being superior to other concepts.