Not learning from an opposing philosophical traditions viewpoint is tantamount to ignoring that tradition, if you ask me. It ignores one the most basic principles of critical thinking, which is giving the other person the benefit of the doubt.
There's also the lessons to be learned from science, and the scientific method. Science, and the scientific tradition, are inherently skeptical (even if not every scientist is). I'd say you'd have to be ignoring this philosophical tradition (the scientific method) in order to claim absolutes.