Thinking (especially, critical) is an energy-sapping, calorie-sapping process! Now, since time immemorial, calories have been considered a premium for survival, and therefore, we are always in a calorie-storage mode! No wonder, there’s dumb everywhere around you! And followers too! People will leave the thinking to you and will blindly follow you... Also, therefore the argument ‘that it must be true because most people say it’, doesn’t hold much water!