this is natures way of making sure the world doesn't get overcrowded. It's a sad fact but people NEED to die.
Then how do you explain the fact that some of the countries with the highest life expectancies, and almost no severe endemic diseases, are also the ones with the slowest-growing (or even shrinking) populations?
Because they don't spit out 5-10 kids each?
Because their 1.9 children will survive long enough to support them after retirement, and since life is not just a struggle to survive, they are productive enough that they can afford to support their parents.