There are many observable objective truths in the world and it's always important to recognize them, but the idea of freedom is more rare because it is a universal SUBJECTIVE truth. Meaning, it exists inherently in the majority of individuals; we don't learn it, we just know it instinctively. Most of us share the experience but there is no microscope or telescope in existence that can observe that experience. We just have to trust it, or perhaps, have faith.

Freedom is not taught to us, we are born with the idea already hardwired. If anything, it has to be conditioned out of us.

We can see the aftereffects of the human experience of freedom in the great upheavals that occur when our societies become too rigid, too controlled and too authoritarian. Some will argue that tyrants have no concept of freedom and this debunks the notion that it's an inherent psychological quality, but this is a misconception. Many tyrants love freedom, but only for themselves. Like an obsessive compulsive, when the average authoritarian sees free movement within the rest of society all he sees is chaos that needs to be micro-managed. He is so mentally unhinged by the existence of independent activity that he is compelled to crush it and impose his brand of "order."

If you want to understand the thinking process of the political left today, this is where you need to start. They believe only certain special people deserve to have freedom (or deserve to live), and they are of course part of that group. The rest of us can't be trusted with freedom because we "think the wrong way," and so we need to be corralled and fenced in.