I was just talking to a friend about this yesterday. I have no grandchildren and I've never had a burning desire to be a Grandmother. I'm sure if I did have them, I'd love them to pieces and spoil them rotten but it's never worried me. My children may or may not have made a conscious decision. I don't know, it's not my business.
If you take a step back then you can see the world has always been a scary place and probably always will be. War, drought, famine etc - have always been with us.
Conversely, the world wouldn't continue without procreation and humans will always have a desire to reproduce.
It leads to bigger questions like should women living in extreme poverty without basic facilities such as clean water be having children?
And who are we to judge?
It's a personal choice of course whether to bring children into the world, but if I had my time again I may choose not to have children but it wouldn't be because of the state the world was in.