As was said, we are not all Wiccans. Goodness, no! I despise being called Wiccan. Although some Wiccans like Lark are awesome and give Wicca a good name, there are many many more ignorant ones that make magick practioners seem ridiculous.
First of all the "Wiccan Rede" was a poem that can't be traced before 1975! Wicca however has been around for about 50 years. So for 20ish years there was no "rede". Many Wiccans do not uphold the rede due to it's origin as a poem published in Green Eggs magazine and then adopted by the religion and altered a few years later to be what you see today. Other Wiccans interpret it as they desire. And still more perceive it as advice, not "rules". Some go so far as to bring a twisted version of karma into it (law of three)...sort of like the Christian hell scare.
Unlike the claims, Wicca is not an "old religion". In fact, it is extremely new and most of the "facts" it was based off of concerning the true old ways have been proven false.
I have nothing against the religion itself. I feel Wicca has helped shed light and create more acceptance for magick practioners. But I disagree with many of its followers and I despise that everyone thinks if you're a pagan, you're automatically "Wiccan". Urgh...
You can read more about the rede history here