The US is a monumentally rich country where people are left to basically rot on the streets if they're currently unable to care for themselves. There's some support institutions of course, and I applaud those that work there, but so much more needs to be done.
Folks would take seats at hawker stands by leaving their 4000 USD macbooks and keys/wallet as markers. No one even bats an eye.
Because Singapore is a city-state, it is covered in cameras. Crimes are much more rare because criminals know they will be caught.
The USA, the most unique country on earth. Solutions that work all over the world can't possibly work here because we're big, or diverse, or X, or Y or Z?
Whether it's healthcare in general, mental health, mass transit, polarization of politics (I think about growing up in Australia where you could be on differing sides of the spectrum and have discussion or debate and still go for a drink together. Moving to the US, I see regularly "I'd rather be dead than be caught having a liberal as a friend" or similar), internet access, or any other thing, the whole "The US is just too different from the rest of the world for any solution to work here that we don't invent ourselves (and won't because we hate upsetting the status quo)."
If Singapore were in the U.S. it would be the second largest city by population.
Singapore has four national languages. It is very diverse.
To take homelessness as an example, police in Singapore can force you to go to a shelter, which is one reason why you don’t see homeless people everywhere. But they also have shelters with space. Many US cities don’t have space for their homeless population. The waiting list is years long.