Sometimes it's also related to religious beliefs against birth control. Be careful about blaming poverty on large families. You answered your own question. You would think that common sense would dictate that if you have no money, you should try your best to prevent having more children. But then again, to me, these people are poor because they have no common sense.
Child pornography is wrong, no matter what the circumstances.
People who get off on child pornography need to seek professional help immediately because they have some serious issues to deal with. Anybody who derives pleasure from the abuse of others has serious problems. Many things in our society need to be re-examined from time to time to keep up with the changing world around us, but child pornography is not one of them. Any way you look at it, child pornography is just plain wrong. As a society, we have the responsibility to look out for and protect those who may not be able to do so for themselves.