I see so much entitled selfish small minded behavior that I don't imagine you would see 50 years ago. Feel free to tell me this is wrong but explain why the individual should come first please.
This is why we must colonize other planets.
Now that mankind has the ability to eliminate itself, it is only a matter of time until we do. Given enough time, all that is reasonably possible will happen. A chain reaction nuke launch only needs to happen once, to end all life on this planet.
So we need to be sure that we don't have all our life on just one planet. "Don't put all your eggs in one basket".
There is no guarantee that we will wipe ourselves out during the next destruction phase. But it won't be our last destruction. Since we may hit a technological capability of settling another planet before the next destruction, I hope we do. It's the only way to be sure.
Come to think of it, there is one way we can be sure of never destroying ourselves. We could just get hit by a comet first. Either way, I am brain-washing my daughter to like the idea of becoming a space-colonist.
With the western population fat and ignorant I do not see us holding on unless some kind of mass religious fever sweeps the west. My worry is that with the decline the nukes will fly and leave nothing for the future generations but suffering. You clearly see the problem but it does not make sense why so few do.