Recipes against unhappiness, chapter 2 - Children

This chapter is about what NOT to do, rather than what to do, to make people less unhappy in life.
One of the most despicable things that humans can do is brainwashing their own children. This is done when they are growing up and learning, when they are most vulnerable and need the support of the adults that surround them, those same adults they trust with their own safety and security. That’s exactly when they get betrayed and permanently damaged. The aim of this subjugation procedure is to install in the youth’s mind functional narratives such as religion, nationalism, patriotism, ethnicity, culture, even preposterous tribal totems such as sport fanaticism and traditional cuisine. It has always been done, and it’s still done nowadays, even where a great emphasis is placed on children’s rights.

Recipes against unhappiness, chapter 1: sphere of direct control

This recipe against unhappiness is quite easy, and it has ancient roots. The concept is simple, its logic unassailable, for it is very basic. Yet few people follow it. The others, almost everyone, spend their days at work, at the restaurant, at the bar or at home, arguing about topics they actually know nothing about; matters that are not directly connected to their lives. And they do it with such a zeal, as if they were defending what is dearest to them.
Let's try to make this point clearer.
You come across a theory, a hypothesis, a suspicion of a global nature. Let's say in the geopolitical, financial or social context. Okay, may be that theory is correct. Or maybe not. Can you confirm it or deny it without leaving your sphere of direct control? If the answer is yes, then confirm it or deny it. If the answer is no, I'm sorry, but by insisting on supporting it you are only wasting time and energy, and you are probably making a fool of yourself on top of that.
Let's take an example.