Yeah. Just think of the dinosaurs. Mammals would maybe never have evolved bigger if the dinosaurs didn't die.
But I understand your wish to save all animals form extinction. I can't stand when something or someone dies. It always makes me sad/worried. I remember how one on my budgies died in my moms hands just a month or so ago, but luckily it was just from age.
my budgies died because I had to move and couldn't bring them with me and I gave them to my friends to take care of. BUT, They were very bad caretakers and they DIED! I cried for them. If I was any younger, I'd cry forever. When I'm around people, they kill animals in front of me! One time, they killed a butterfly by smashing it on purpose! And one time, they got a mini lizard and killed it because it was in their hands. I hate those guys. So not sensitive of them. Cruelest people ever.