I have a very very tiny tiny inkling of how difficult, after spending several weeks with my sister, her husband, and their (now) 8-month-old. And I know that what I see and feel is only a tiny fraction of what they see and feel. It's the best shot of birth control I could ever get.
And yet, parents -- on the whole -- love their kids, would do anything for them, and believe that their decision to have kids was the correct one. Holy biological imperatives, Batman.
I really hate that there are so few kids in SF. I wish SF could be a more kid- and family-friendly city. It just seems like too many things need to be fixed to make that happen in any reasonable time frame, and it's tempting to suggest that other things -- such as the housing crisis -- are more pressing and deserving of people's time and attention.