QwB is correct. The tears are not just fake, for a couple of reasons.
The grieving process is different. In many non-western cultures people display mourning behaviour that is sometimes refered to as professional mourning which, while to the western way of thinking may be true, it is a valid part of the grieving process. If you have ever been to a funeral in an Asian country you will know what I mean when I talk of different/more outwardly emotional behaviour. This may fire-up at different times with different attendees, hence the people looking on that may seem uninvolved.
Also, they may be crying for their uncertain future - these are the country's lucky people, so not the ordinary folk - as well as ( no doubt) the people who feel it is a good idea to so.
The book, The Aquariums of Pyongyang is an interesting insight into the world of Nth Korea for anyone intersted.