Some choose to not believe anything that anyone says.
And what do you say?
(you gotta be highly suspicious of the group that shout the loudest, especially if they are pretending to be do-gooders out to "help and inform you" they claim they are not effected in anyway, but just on a mission to convince you of their truth. Empires have always claimed to be bringing civilisation to the savages, for their own betterment of course)
TL/DR Trust NO ONE