Please don't laugh at something like this. They were raised in a cult-like atmosphere where they believed he was a god or their father (the male student crying out near the beginning of the video is calling him "father"). If you were raised in that environment, you'd be doing the exact same thing. There is nothing to be gained by making fun of those poor people.
It's also very possible that those people were putting on an exaggerated show for government officials.
Edit - if this is for Jongil and not Ilsung, then you have to understand that, while they didn't fare well under Jongil, now that he's dead things are even more dangerous and uncertain. They face imminent starvation and hardship and possibly war. That alone would be enough to make me cry.