<<“Dark forest theory” holds that civilizations fear one another so much that they don’t dare to reveal themselves lest they immediately be considered a potential threat and be destroyed.>>
https://techcrunch.com/2019/01/20/te...s-dark-forest/
Cixin Lui, a chinese novelist who wrote "The Three Body Problem"
has describe a few scenarios that show pretty scary reasons why aliens maybe and humans also maybe should hide. Great works of fiction. Trilogies.
GlennB