Yea, Koreans are pretty abysmal at awareness in a social setting. But, you're charging people with the expectation of crowd mechanics and capacity limitations which isn't really something to be expected from the average person. Imagine you're inside of one of those clubs or restaurants, owners are telling people they're closing and to leave (it was reported that some restaurant owners were closing up and kicking people put and into the crowd without knowing about the size and scope of things outside). And you went when it was busy, certainly, but not like it now is. The last train just let out, a massive crowd from the already busy streets just poured out from the densely packed alleyway restaurants and bars and clubs, and now that pack of new crowd for the final train is coming towards your exit path, and the path behind is also already packed to the gills. Can't go in anywhere, people from the crowd incoming start pushing, from up a narrow and steep hill, down toward you while people behind continue to try to push up. A group uphill heard there was a popular celebrity and are vying yo get to see them down behind where you are at. They push, suddenly, and strongly, and behind you, someone falls on the slippery, littered, and uneven pavement leading up towards the bottom of the alleyway. A few more people trip on them. Suddenly, everyone is completely falling all over each other, and the crowds behind you and above you up the hill don't stop because they physically can't see or feel what's happening. No amount of awareness, aside simply not going, prepares anyone for that. Event planning, safety procedures, and careful organization of large crowds are basically the only thing to prevent these issues at such a scale.