Webstral's post made me think of something else, something humans have been happy enough to do in the past to foreign cultures - religious conversion.
Perhaps the aliens are "invading" to convert the heathen humans to the true faith, if they don't convert willingly then they'll be forced to.
Maybe they made peaceful overtures to the world's governments and said "convert to our faith and be part of the wider universe". We responded with "No way" and they said, "Fine but now it's convert or die!"
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