Manners in Singapore

Where are they? No one says please or thank you or you're welcome. I always say thank you to cashiers, taxidrivers, etc, but they rarely reply. Are people so unfriendly or poorly trained that they can't even bother to give a reply?

Why aren't parents, teachers, and employers teaching people to have good manners?

How are the new casinos or integrated resorts going to survive if people are not trained to be polite?