Lol @ discussion in RI.

When you've dealt with hundreds of people who are about to die, I'm sure your feeling towards them changes.  IDK about there, but according to reports here, doctors often work long hours.  I mean, they probably want to help (personally have no idea though), however resources are probably limited, and they need to take care of themselves too.
Although it may seem ethical to help third world countries, ultimately there's some point where people need to care about themselves and turn a blind eye.  For one, I don't think too many doctors really have that much of an incentive to work in those countries.

In other words, money is an incentive for people to work as doctors.  I'm sure there were some that did it to be "good Samaritans", but the world is big and I don't think these last too long unfortunately...