Your post reveals a worldview that the lefties don’t share.
Your post is based on the assumption that “objective truth” and “objective reality” actually exist.
The don’t believe that.
They simultaneously believe that one can immediately grasp objective truth, and that there is only one correct path to it.
The have no comprehension that a long and sometimes convoluted mental process is required to elevate one’s mind to the level of comprehending an objective truth, and that there may be numerous paths (some more suitable for some individuals than others) to it.
Put another way, they believe they instantly understand something, and the way they understand it is the only way to understand it - dolling out punishments for anyone who grasps it differently and/or concludes it’s wrong.
Cognitive dissonance culturalized.