alt Hacker NewsDerren Brown's book "Happy: Why More or Less Everything Is Fine" (which is much better than the title might lead you to believe) does a very good job exploring the philosophy behind this.
The choices we make have meaningful and value in large part because we sacrifice a fraction of our finite time and attention in order to do them. But once you have infinite time, then the value of everything you do becomes zero.
by that logic things done during shorter lives are more valuable, so you should kill everyone as soon as possible to make their lives more meaningful
lotta people in this thread with anti-life beliefs