Actually that Wiccan activist isn't a friend, just someone I heard of and as someone who has studied logical and cognitive fallacies in psychology it feels very contradictory. I've also seen witch blogs on Tumblr emphasizing "does it work?" and critical thinking; typically these blogs are dedicating to berating other witches on Tumblr who have an "anything you do is legit magick" attitude toward witchcraft rather than traditional sources.
as i said, no matter how much we study about fallacies, if we have a deep wish to believe something, gullibility takes over and we put rationality aside, so that our wish is satisfied. at the end of the day, wicca is usually a harmless superstition as they seek to live in harmony with nature