I think many people would agree in the abstract that donating some amount of their savings to developing countries is the right thing to do -- many more people

I think many people would agree in the abstract that donating some amount of their savings to developing countries is the right thing to do -- many more people than actually do this in practice. Saying something ought to be done is not the same as doing it, basically. And of course, while donating to poor countries is fundamentally similar to Question 3, in practice it's obviously not the same; people do seem have a 'moral discount' for things that occur farther away (geographically, temporally, or otherwise).