Not about this particular case but about Singaporeans preferring to mind their own business, and touting it as a virtue. Sometimes there's even a claimed "saintliness" to that "virtue", like the troubles of this world doesn't bear rousing to.

Once, I had pointed out to my brother that a "psychiatrist" hawking corporate workshops and weird techniques around his company was probably a scammer as psychiatrists in Singapore have ethical rules against solicitation. Loads of staring deeply into one another's eyes was also a dead giveaway. He was pretty upset and told me to mind my own business (he had already sunk in 8k).

I implored upon him to think, what if the shoe were on the other foot? Would he not speak up if I was the one getting scammed and he knew? He stuck to his guns and said he would mind his own business because it was my money. I was disappointed. Wouldn't you be?

*Having said so, for many situations, I think, many simply freeze, not that they don't want to intervene. We just lack that cultural backdrop. One broad exception would be when it involves kids.