You seem to have started with the premise that "tribal" societies are superior in some way. I disagree.
Additionally, kids have parents because they're extraordinarily unskilled at balancing the long-term perspective against the here and now (granted, many adults aren't much better). I find it hard to believe that just letting your kids do whatever they want is really the path to greatness for most kids. I think parents should help kids explore their passions but it seems there's a balance to be found where you also don't let your kids give up as soon as it gets difficult. My parents did that too often, and my wife's parents pushed her through the rough spots. I won't go into the whole results, but it's clear to me which is superior.
What aspect of the 'tribal' spirit, as I noted above and as discussed on historyexplained.com, do you object to? I'm sufficiently fond of freedom, and sufficiently disgusted by cringing, fawning, and gossip magazines, that I find such a social structure admirable, although, on the other hand, I'm also fond of not dying over a point of honor, so there's that too. (And note, part of my premise above is that "tribal" doesn't have to mean "primitive.")
Also, please explain why you think it's important for parents to push children when they run into difficulties. I agree that there is a certain amount of basic knowledge, which everyone should acquire whether they want to or not (I've even found benefit from statistics classes). But we're talking about passions -- that is, recreations, not basic knowledge. I agree that encouraging someone to get through difficult spots -- to reassure them if they fear failure, to provide superior knowledge and skills on an as-needed basis -- is a good thing, but the whole point of a passion is that it's something that the person in question _wants_ to do.
That's a good point, but I think that that lesson would be better learned in the core-knowledge curricula (which the child's going through whether he/she likes it or not) than by wrecking his/her enjoyment of computer programming or violins or model-building or first-person shooters or whatnot.
Additionally, kids have parents because they're extraordinarily unskilled at balancing the long-term perspective against the here and now (granted, many adults aren't much better). I find it hard to believe that just letting your kids do whatever they want is really the path to greatness for most kids. I think parents should help kids explore their passions but it seems there's a balance to be found where you also don't let your kids give up as soon as it gets difficult. My parents did that too often, and my wife's parents pushed her through the rough spots. I won't go into the whole results, but it's clear to me which is superior.