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They might be nasty critters, or heard space gossip and rumors about what humanity is like and just flatten us out of existence. .. attack us from space .... infect us with a disease.
It's when the female of the species starts twisting my ears I should worry.
I've got some rather nice biscuits to offer them in the spirit of friendship.
The scene with Bugs bunny and the Aliens come to mind here.
If Aliens landed and saw you giving them a biscuit, they might misinterpret as something else and do the same to you as they do to bugs bunny lol. You need to watch the to see what i mean (the scene in question starts at 1:18)