If you lived in a terribly unfortunate place with lack of food opportunity and water why on earth would you have kids ? Like why ?

I think that in situations like that the women involved do not have a lot of choice in the matter. Contraception would probably also not be easily available. Many men refuse to use condoms too.
Religion and culture also play a part.
The best solution seems to be education and the improvement of living standards, especially for women. That is not always possible though.