Yes, there were crappy drivers. But that is not the main issue. Like I said, HK has not really experienced icy roads in prior cases of temperature approaching or below freezing at TMO. It is usually dry condition with no or very little precipitation. They cannot be expected to know exactly what the conditions are like up there. Not even the HKO does until after the fact.
This is not about common sense but a lack of experience. Sure, they know water freezes at 0, but they really don't know what that environment is like. That is the issue. To expect them to know what these conditions are like as if they lived in cooler and more temperate latitudes is unrealistic.
But now they do know. So next time similar conditions occur at HK, most should act a lot smarter....hopefully. Lesson learned. Price for stupidity and lack of experience is paid.