"One who gives up easily"
"Defeatist, deserter, or shirker"
At the end of the day, if you are gonna scold your citizens for Giving Up Easily and being Deserters or Shirkers, you should recognise the sheer irony of importing even more quitters from other countries to take our places.
Although I have gone a little off-tangent, let's steer right back to my original question! Is Singapore unique in criticising its citizens who emigrate? Do drop a comment!
"For every one person leaving, Singapore takes in eight - most of them equally skilled." - Fight or flight, by Seah Chiang Nee, 26 August 2002