What do they do? Why do they say that?
Most Helpful Opinion
The aura of bieng afraid of what one doesn't know.
because they are quiet , they are mysterious ,unknown and unpredictable , thus they seems scary .
But I would say that bieng dangerous is equally represented in all types of personalities really.
It is just the first impressions that deem the quiet boy as mysterious while a laughing popular guy to be fun. But both can end up dangerous equally in the end.