Try explaining that one after death.
“How’d you die? I got eaten by a T-Rex!”
“I, um well, I…I was going for a walk to find food and I know following this big guy who never eats the lower stuff is great, he cant reach it and the bugs that fall off the trees hes eating are great! As I was munching on a fleeing bug, the big guy burps and I looked up to see him puke. No matter how fast I tried to scurry away the goo was too much and it squished me flat”
“Oh, I’m sorry to hear that, hopefully you have better luck on this side”
without people on the planet to remember those who lived, the memory dies