A documentary I saw about the human brain gave an explanation for this: the brain always looks for the easiest solution because it wants to preserver as much energy as possible (it has already enough to do in the modern world). It is just natural that energy follows the path of the least resistance.
And that is the reason we don't have Plato's State :)
Half of the world is just struggling to get by: job, food / water, security, etc.
Most of the other half doesn't need much thinking either; just try follow a generic life script: go to school, get a job, get married, have kids, die.
Tell me who is gonna call out governments on the stupid shit they do? The stupid? No, they are too busy drooling. It's the thinkers. They are always troublesome. The less of them, the better /devil advocate.