Life continues after death, why potentially extend the agonising wait?
Fear is never a good answer, there has to be a way where you can accept your death.
This is kinda debatable; I mean so far there isn't anybody we know of that has come back, to the point where even most religious scholars agree that "resurrection sightings" of famous resurrections (such as jesus) weren't of the physical form but of the visionary one (Jesus Seminar: "In the view of the Seminar, he did not rise bodily from the dead; the resurrection is based instead on visionary experiences of Peter, Paul, and Mary.").
And if there isn't anything after death then, at least the way I see it, you should be actively fighting to not die for as long as possible. It's like a game; as long as you are playing than your skill and experience can forever continue to increase, and even if your score dips due to setbacks and missteps as long as you don't actually quit then you still always have a shot at that leaderboard (one that would continue to improve as your skills did). Once you quit and walk away, though, that's it, and your score will never get up there on the board (or even if it does it will certainly be knocked off eventually due to its static nature).
Re: Child Immortality Editing,
The way I see it is that if you take a baby and made it immortal somehow through gene editing (like some form of keeping your growth/repair mechanism on without you turning into a giant blob of cancer), they could always euthanasia themselves later, but if you can only perform the first change before they were born then you can't necessarily go the other direction and make them immortal later.
It's kind of funny, but I think the arguments we would see would be almost the same as the abortion ones, just in the opposite direction "not curing your child before birth is murder, plain and simple!"
I try to to worry too much about transhumanism and focus on how awesome it is that we're going to Mars.
Mars is indeed really awesome.