Jumpseat trips - are they actually as rare as people think?

[Bealzebub]

Under the posters name it says:

Location: Norway.

A clue perhaps? The poster also clearly states:

I'm an ATC student in Sweden.

Nothing to suggest any of these events are occuring in countries such as the UK or USA, who expressly prohibit unauthorised persons in the flight deck, while flying within their territory.

Presumably those scandinavian countries see no need for these measures?