Well, we seem to have exhausted this topic...did we want to give Paulbot's initial comment a going-over?I'm inclined to agree myself, a single life for an entire species seems more than fair enough to me. Even a species-for-a-species is arguably OK, subject to a variety of other factors. Where the blowing-up-the-sun routine crosses over into not-cool IMO is that there are a lot of different life-forms on Earth, so blowing up the sun would wipe out all life on Earth and thus many species rather than just one. Likewise, there are a lot of other stars around, most if not all without life, so it's not like there weren't alternatives...which seems to be (spoiler)where the other Primes came into conflict with the Fallen.