Serious question: I get why the govt would cover up and want to control the presence of NHI….but why would NHI go along with the coverup?

I can’t wrap my head around why an intelligent life force would find their way to? Return to? (Depending on what theories you believe) this planet, but encounter a powerful/elite/secretive group of people who want to control the NHI advanced technology and coverup NHI existence. What incentivizes the NHI to go along with the coverup?