Horror is all around us folks ... you just need to look.
Horror is a shifting genre, and often is a direct commentary on society, given that Sweden and America have two different takes on society, the depiction will be different.
Cooper: Hmmmnh. Could be the punchline to one version of my imaginary vampire film — the scene wherein Our Protagonist Recoils in Horror from a Colorized Version of Nosferatu.
There are plenty of "upbeat" ending in horror movies; mostly tacked on by Hollywood producers who don't want to disturb the audience, but don't they realise in essence that's exactly what Horror is there for?
In other words, Glee's take on Rocky Horror is more of a sampling than a full taste.