Since I've seen several examples of this mentality within the thread, I am obliged to say:
It seems completely silly, to the point of almost being ignorant, that people continue to have the viewpoint of, "Oh, we're overpopulated anyway, just let the people die!", and then somehow use this to support their idea that we don't need to test on animals for life-saving medical treatments.
Guess what? The carrying capacity of the Earth is NOT some arbitrary number. There is no "oh, at 10 billion people you're overpopulated" or "at 6 billion people you're overpopulated."
Sorry, it doesn't work like that,
What determines the carrying capacity of Earth (and, furthermore, what makes us 'overpopulated' or not) is consumerism, not a number. The problems linked to the nonexistent 'overpopulation' problem are direct results of wasteful use of resources, NOT because we magically have 'too many people'.
If everyone on Earth consumed like the average American does, we would need five Earths to supply us with what we need. And that there lies the problem- consumerism. We consume too many resources, buy too much stuff we don't need. If everyone used resources wisely, we might be able to support ten billion people on here without scarcely making a mark on our planet. If we continue to be wasteful little buggers, our 'overpopulation' could be only one billion people. What determines so-called 'overpopulation' is our resource use.
Instead of saying, "Oh, just let the people die!", which sounds cool and all until it's YOUR loved one that is about to die, perhaps people should use their resources more wisely. Maybe you /don't/ need fifty pairs of shoes or three gas-guzzling cars, or need to waste all those precious gallons of water on your stupid lawn (which btw consumes more water than corn), or need to get a brand new phone or computer every single year because your old one is 'outdated'.
Funny how people get on about large families, such as the Duggars with their twenty kids, and how they contribute so much to overpopulation...when they don't. Your spoiled teenager and family living in suburbia likely consumes resources many times over than what the Duggars do. The Duggars go shoe-shopping once a year and buy nearly all of their clothing second-hand, versus spoiled teenager-in-suburbia who shops in overpriced department stores as a recreational activity done multiple times a week.
Just food for thought. There is absolutely no reason to ramble on about fixing the (supposed) overpopulation problem via senselessly letting people die. More than likely, it's YOU that's the problem.