He's a citizen of the world and is doing what he feels is best for the future of his children. I see absolutely nothing wrong with that.
Mankind has been striving to improve their lot from time immemorial. Singapore his hardly unique in playing the role of stepping stone to something better. Many sinkies have done the same.
It's the idiots who sit on their lazy asses and do nothing to improve their lives who deserve to have spurs stuck in their hides.