Countries have pressured other sovereign powers before, and the US is just following in the global-political norm. The fact that pressuring a foreign power is done should not upset you as much as the fact that the Swedish government caved to it.
Expecting the US government/embassy not to pressure a foreign power over something that it perceives as being illegal, and if not illegal then something exceedingly close, is illogical. Politics is looking out for one's own interest. And it is in the interest of the US government to push prosecution of foreign pirates, whether they are digital or Somali, so that a "US industry" can thrive.
I personally hate Hollywood and watch less than 10 movies a year (most of them are older and gotten from the library). However, I can't disagree with my government in that the founders of TPB got what they justly deserved.
Globalization of corporations and corporate interest profits the corporations, not the citizens. Not ever.