Politically correct tosh. What films like that never tell you is that one of the main reasons they are in the situation is because they hate the person next to them, their religion tells them to hate the person next to them, their own governmets are corrupted and waste the massive amount of aid money they get. The world is just overpopulated, period.
If it did just have 100 people on it, those problems wouldn't exist. If it had 100 million people on it, those problems won't exist, if it had 1 billion people on it, those problems probably won't exist. As it has 6 billion and growing people on it, those problems do exist.