Consults with Trees
Why do you assume this is the intent of preserving one's culture from outside corruption or change? Why do you paint keeping to one's traditions as being robbed of agency and autonomy? Why do you believe that and who taught you that?How could the intent to keep others ignorant and isolated, thereby robbing them of agency and autonomy, be seen as anything else? What motive could there be other than to hold power over others?
But it just isn't true that knowledge only threatens what you believe to be deceit and falsehoods; it's not even that hard to think of examples that counter this. The impact knowledge has on peoples and cultures is really not as straightforward as you're presenting here. Social trends and cultural traditions - both ones you favor or those you disfavor - all spread through knowledge and information.Sharing it is an empowering gift. Knowledge only threatens deceit and falsehoods, which only hold people down and their cultures back.