So I can't complain that the train is late because somewhere in the world other people don't even have trains?

I think you missed the point I was trying to make.

My point was simply that it's a not very controversial that the living conditions around the world are getting better, thats great.

But it does not mean that it's getting better for everyone and especially in the developed countries it's actually going the other way which is relevant to discuss as this might mean that things can't continue getting better.