THe West depends on the people in other nations to produce their wealth for them. Through their workers, through growing luxury foods on their land (while they can’t grow the food they need) and by using their natural resources at low low prices. The workers are hired at pricec that do not cover the cost of living in a decent way, they work in unsafe conditions, their surroundings and environment are often abused and polluted, they recieve little or no health care. All of these are things we wouldn’t allow in our countries.
Now, their governments would seem to be at fault. However, the West is very careful to keep these things the same in far off countries, through organizations like the IMF, or just plain political strong-arming, and making sure the elite in the exploited nations are very comfortable and a good army to suppress uprisings… The prosperity of the West wouldn’t be at nearly the level it is without the poverty of much of the rest of the world, and so Western governments actually try to maintain the status quo. This is also true to a lesser extent within countries like the USA, where the rich depend upon a poor underclass to maintain their standard of living.
The other people that are bilked are future generations - that is, our prosperity depends upon us using resourses at a rate that ensures they will be used of in a relativly short time - so the future will likely be less prosperous.
There are only a limited amount of resources and energy available to us. Even at the level of the entire universe, there is still a finite amount. But our economic model takes unlimited growth as one of its fundamental premises. It assumes that more growth is always possible, and actually needs it to function. Our banking system would fall apart if growth were to stop. Thus it depends on making people more and more rich with material goods, and depends on making wants into needs. Unfortunately, this premise is not in line with the actual facts, which suggests that it is a fundamental error.
And that particular error is, I suspect, where many of the problems in our economy lie. As far as I know, there is no modern economic system that starts from a more sound premise, though I know this is an area that many economists are looking at right now. Interestingly, the Church also recognizes the fall-out of that error as leading to problematic behaviors and actions in reality.
On another note - I agree that it would be the best if the rich would willingly share their excess with those who lack. I also think it would be best if people refrained from having abortions, or contributed money for health care and roads on their own. But I still think that government should act on such problems if required.