Moral fundamentalism is immoral

Continuing this post, another quote from the book which also applies to the belief in unmediated access to absolute, universal truths of any kind:

"The greatest sin of moral philosophy is moral fundamentalism, by which I mean the belief in unmediated access to absolute, universal foundational moral truths. Moral fundamentalism typically takes one or both of two forms: either it assumes that we have access to absolute moral principles, or it assumes that we have access to foundational moral facts (about what is good, right, virtuous, etc.). Fundamentalism is a sin because it (1) attempts to reduce the relevant complexity of human experience to simple abstractions, (2) denies the human necessity for interpretation, and (3) shuts off moral inquiry. These are three of the worst things a person can do when it comes to engaging in moral deliberation."