That standard comes from the burden of proof being on the potential aggressors to be sure they aren't harming a sentient being. It is not up to victims to know how to communicate with their aggressors.
Agree with this, reminds me of how angels in the Bible usually drop the "be not afraid" whenever they show up.
The recent Adam Sandler movie "Spaceman" had an interesting alien. A giant sentient telepathic spider finds its way onto Sandler's spaceship and when they first meet, his first words are something like "Do not be afraid, skinny human."
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