Oh they are from poor countries earning $$$ to provide their families a better life, so MUST we say "Please throw your where you like". Once, I drive past & saw 5 NEA officers got surrounded & threatened by them. A contractor told me, every Monday he collects 3 truckload of rubbish.
As in my HDB lifts, I alway XXXX and scream at the FT maids & workers when they left the rubbish in the lifts. They simply say this is the best way as the chute is too small for the items they throw, and nobody is so Kaypoh to scold them in their countries. Lastly, not all locals are TRUE local. Indeed, there are good FTs, but only the nunber is too small until cannot see.