People have to understand that there are places on this Earth that simply can't sustain a large population. I find it hard to watch as people in some of the dirt poorest places on this Earth are raising large families.
I guess I find it equally hard to watch as unnaturally large populations in what are effectively deserts are sustained by food donations from western countries like Canada, USA, Britain and Australia. I know it's hard to watch as a famine decimates a population, but keeping a large population alive by sending food to those areas is only delaying the inevitable. Eventually the natural order has to prevail, and if the land those people live on can't sustain a large population, then eventually the population has to come down in those areas.
And, truth be told, Las Vegas and Phoenix, Arizona are just such examples of how importing food to areas that couldn't naturally sustain a large population can only work for so long. Eventually, that large population uses up the resources and reserves of the area, and then there's problems... water being the obvious one. As it stands now, Phoenix, Arizona gets it's water from an underground aquifer. Essentially, it's a huge underground oil reservoir filled with water instead of oil. But, Phoenix is already having to curb water useage because the aquifer is running out of water.
In all of these cases, eventually nature will prevail, and those areas of the Earth that cannot support a large population simply won't have a large population.