They are politicians, and politicians are at the mercy of their voters which happen to consist of a large chunk of filesharers.

When the Pirate Bay's servers were raided a few years ago it turned into a political scandal, and (if I remember correctly) a minister was fired.

Also, The Pirate Party was very close to getting elected into parlaiment at the last election in Sweden.

If I was a Swedish politician or authority I would definitely care.

You'd think they would give a little more weight to the group, considering that the users of TPB are a good chunk of the internet-using population of the world.