[xherberta]

Curiosity killed the cat. We’ve developed disgust and taboos and physiological responses like vomiting to safeguard our interactions with living things that are small enough to eat.

Perhaps an advanced form of life/intelligence that has survived contact with various others would be guided by some form of wisdom/disgust/caution/discretion. It would not be surprising if they noticed little clues like our rapid deforestation, rising temperatures, shrinking ice caps, nuclear detonations… which would make us seem slovenly or likely to have “poor friendship skills.”

[midoridensha]

Or perhaps they'll observe and make contact with various different intelligent species on Earth, not just humans, and then decide that humans are making the planet inhospitable for other intelligent species like humpback whales, so we need to be eliminated to save the rest.

[geysersam]

Or maybe we're the friendliest they've ever encountered. People like to present humans like some godawful species. It's more likely that we're in the middle of the spectrum.

[juliendorra]

Primatologists indeed rate humans as less aggressive than for example great chimpanzees. But more than bonobos. So we are not the most agressive primates or species on earth. That must count for something, doesn’t it?