Very much agree. Taken to the extreme, complete suppression of tribalism would not only be extremely difficult but also extremely harmful to society, as even the love between children and parents will be destroyed in favor of egalitarian love. Our biological nature causes children to prefer their parents more than any other parents, and in doing so, prefer their siblings (their parent's other children), more than any other children, and prefer their parents' siblings and parents more than any other elderly persons and adults. It is this nature, as it radiates outwards, that causes one to feel greater love to those who are similar than those who are different.

I don't want to live in a world where children are taught to betray their parents in favor of their state, where children are taught to report on their parents for their crimes, where brothers treat each other as strangers, where husband betrays wife and vice versa, at the same time. I've already read about it in 1984.

The harm in suppressing this aspect of humanity comes from having to involve the state. It takes the state to educate children to report on their parents crimes. It takes the state to force children to attend schools to study the same subjects. It takes the state to extract wealth from parents to distribute it to other children. It takes the state to enact taxes on children to distribute their income amongst other parents. Taken to the extreme - you'll get a very big, very powerful state, because it must involve itself in everyone's personal relationships, to ensure equality amongst all. And with a big state, you get corruption, you get misallocations of capital, you get a concentration of power, all of which would lead to a state that would monitor its citizens every communication, to protect its power in actuality, and to maintain equality and protect its citizens in name. And, as you reduce every person's natural relationships, people will form relationships with others, leading to divisions not amongst genetic or even geographic lines, but amongst other arbitrary lines such as class and wealth, government and private. As a group of people gain control of state, the actions of the state will begin to benefit some, but not others, arbitrarily, so that in actuality equality (in wealth, status, whatever) will always only be an illusion, and inequality will always manifest itself in other ways, so that all those resources supporting a very big state to maintain equality, are mostly wasted, except in so far as it provides an illusion of equality, which it can maintain for only so long.

Oh, wait.

I agree that tribalism probably was one factor that allowed humans to survive to reach the modern era. However, that doesn't mean that it is still a desirable survival trait now that we're in that era. The world is vastly more populated than it was 30,000 years, or even 100 years, ago and the tribes are bigger and have more opportunities for conflict now.

I would very much agree. Tribalism should stand alongside the greatest achievements of humanity, like Religion, the discovery of War or "the invention of negroes, or, of the present mode of using them".