It's not really a tangent, it's just part of the same continuum. The basis being that there are no moral absolutes, there is not "real" truth, it's all relative, and nothing has any objective reality.
Except, of course, the leftist world view.
a couple of years ago, i got in to a discussion with the high school principle where my daughters had attended. i was upset about a survey sent to me that was used to rate the school district by the public, and having studied some statistics, the survey was designed to get high scores. i wrote a letter expressing my opinions that the survey did not enable me to express to the superintendent, who had the principle call me. after 30 minutes of conversation, i learned that at least 25% of the students did drugs or alcohol on campus, the school had a no drug policy, the policy was not being enforced much and that the principle did not want to be sued for enforcing the policy (suspension was involved). thinnking this guy had no spine, i began discussing this with my friends in the education field. all told me that to be an administrator, you have to take additional classes and one of the topics, to paraphrase, is, "how to stay out of court".
as far as i am concerned, state gov't, fed gov't, school districts and the courts are all corrupting our school systems, and the "system" makes it difficult to teach the truth of moral absolutes.