“The Left does not like the idea of human nature. It tells them they are not free to do what they want. From a factual perspective, it tells them people do not change much, so the way things were in the past is mostly how they will be in the future. From a moral perspective, it suggests a standard for what is good other than satisfying desire, since it tells people to act in a way that fulfills their nature, or at least is suited to it.
“The Left does not like any of that and they have been very successful turning their dislike into accepted dogma.” – James Kalb