This song has always kind of (to me, at least) seemed like its about forced and fake happiness. "and everyone shakes to the beat with a barrel down their throat" is like everyone is having a good time, but not genuinely, but if they fail to at least seem happy, they will have to face dire consequences.
It also kind of reminds me of a thing that a few of my friends have gone through, where they are depressed and/or upset and nobody does anything about it but tell them that their problems don't really matter and that they should just be happy, because that's what everyone should be.
So idont know, that's what I always think of.
