Colonization has ruined quite a few people's days, as have poaching, and there have been literal zoos with humans as attractions. An alien species could also ha

Colonization has ruined quite a few people's days, as have poaching, and there have been literal zoos with humans as attractions. An alien species could also have motives that are entirely unrelatable, or even simply cause us harm due to carelessness or mistake. Besides, we don't need to conclusively enumerate each and every reason that someone might have for ruining our party to recognize that it's possible.