This is the main reason I never want kids. I'm just not sure I'll ever be secure enough while young enough to really care for them. Student loans being the main killer; if I could get rid of them and buy a house, things might be different.
But, more than that, I'm also not sure if I'll ever be secure enough to make sure they're secure in the future that seems inevitably coming, with regards to global warming, etc. I just feel it isn't responsible currently.