For the same reason I don't "just accept" that I'm going to die, or that there is no justice in the universe. I want to live longer than my parents, possibly forever. I want to impose my sense of order and justice in the world, because I don't like chaos.
I want live more comfortably than my parents and my kids more than me (and thus growth). Of course I accept anything, but why should I? Isn't being human making sure you always progress?
But you are going to die. This[1] is a very thorough walkthrough. Wanting to live longer than your parents is one thing, but "forever" is a long time. I'd go as far as to say that if you think you can live forever, you don't understand forever.
>no justice in the universe.
Justice is an idea created by humans.
Wanting to improve yourself and the world around you is a central human trait imo, but there are some things we will never completely fix. One of them is death.
I want live more comfortably than my parents and my kids more than me (and thus growth). Of course I accept anything, but why should I? Isn't being human making sure you always progress?