Other people are more threatening to our survival than any animal on the planet.
If you think about it, it doesn't take a lot of brain power to hunt a woolly mammoth. Perhaps there was a minimum requirement to hunt the way we did. But maybe our current situation is the result of a runaway chain reaction of bigger and bigger brains so that we may better compete with ourselves rather than other animals.
The "whole dumb people reproducing more" meme may be true in some places, but in others, I bet that dumb people don't live very long. And by dumb I don't mean uneducated, I mean unintelligent. Someone with a lot of street smarts is intelligent, they just learned different things, and those things were needed for their survival. Someone unintelligent in an unstable or failing society is probably going to end up dead at a young age. While the smart ones live to become village elders or guerrilla leaders or whatever, but most importantly - mothers and fathers.
That said, both of our comments are off-topic.