This is a combination of having inherently a cultural enlightenment, promoting individual freedom and autonomy, and with a strong cultural history of people being self-reliant and independent. This makes them somewhat more resistant to manipulation by the interlopers, just as with someone who is spiritual and praying for divine protection. That is part of the story, the other part is that Sweden is not a major power needing to be humbled or maneuvered into starting a war, for example, so that nation is not bothered with to the same extent as the superpowers. But they are certainly not being given favored status, with respect to survival; they will be killed along with everyone else if the extraterrestrials get their way.
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