(a) Sex is cheap, good entertainment. (b) If you are already poor, children aren't going to make it any worse. (c) For some reason, most people really want to have children. (d) Humans aren't exactly rational creatures.
Free birth control, as well as better sex education (which is, from what I've read, hilariously bad in the US) would probably help quite a bit.
People don't plan to remain poor forever. Some of them become poor after they have kids, while others hope things might improve in the future, since the life of the poor always fluctuates from bad to relatively better off.
Besides, who are you to tell someone they couldn't have children of their own just because they're poor? It's their right to conceive and adopt children, just as it's yours.
In fact, they could easily afford to feed their children and lead a happy life, wasn't it for the rest of the well off society that's making their lot worse than it is, by comparison. Being poor in a rich town is worse, both materially and psychologically, than being one of a larger poor community.
Well, if a person complains about being poor and still have kids, I find the right to point out to that person the obvious planning mistakes in his life, It's not like I am shouting at random poor people now, is it?
Yes but many of the complaints centered around not being able to provide for said children. Is the purpose behind having children just to hold them up for pity?
It is their right to have children, and it's my right not to pay for their children. How is it that the rest of society makes it harder for them to feed their kids?
(c) For some reason, most people really want to have children.
"For some reason"? Is natural selection not a good enough reason that people have this desire?
(d) Humans aren't exactly rational creatures.
True, but not relevant when talking about goals. Reason cannot tell you that your highest goals are right or wrong, only that some action or lesser goal is right or wrong with respect to a higher goal. I think the drive to reproduce is probably a pretty high-level goal, and while wealth has temporarily short-circuited it somehow in many developing countries, that situation doesn't seem stable.
Free birth control, as well as better sex education (which is, from what I've read, hilariously bad in the US) would probably help quite a bit.