Who said they have to be stupid and reckless? It's pessimistic to think people can't make a mistake here or there. Like, they don't particularly want children, but they also don't particularly want to avoid it, so an unplanned child may happen. Or there are broken condoms, or misinformation, and the very unfortunate but possible scenario of rape.Being that it would take a massive undertaking to figure that out for sure, we can only assume. I think assuming that the vast majority of people are stupid and reckless is depressing and pessimistic, so I like to look on the other side.
I'm abstaining anyway, but I do think most kids are accidents. Call it stupidity and recklessness, I just find it more likely. Then again, I know that I know nothing. :3