Have you ever play cards before?
You must play the cards that you are dealt with at the table isn't it
For these migrant workers, their home countries are poor, so they have to leave their families and kids behind to work in the sun
Yes they can buy huge land after that, but they suffer for years away from their families , never see their kids grow up. This is their hand of cards.
Singaporeans can do this too actually, just work hard, save the money and migrate somewhere with cheap land - no need 3rd world country, Australia or Europe also can
But if the hand you are dealt with is being born in Singapore, and you want easy work and big land in Singapore, then it is not reality.
You are not accepting the hand of cards you are dealt