They sort of naturally do that if you have the appropriate challenges and opportunities around them.
> ancient pyramid aliens or discussions about how veganism will help your body.
There used to be a tabloid called "News of the Weird." This stuff just exists. You'll find it anywhere people gather. We're story tellers. When we don't have a compelling story we just make stuff up. It's identical to the point above.
> even all the adults can't come to a shared understanding of what is "good" or true.
It's not possible. If the children are intended to inherit the future then this is a flawed and reductive strategy. You will not achieve what you seek through parochial means.
Really.. I think your biggest problem should be advertising. It should be nowhere near children. Ban _that_ but keep the social media.