Stuart,
Thanks for your comments and concerns. I do know that the cofounders of World Naked Bike Ride are actual naturists. They are active in trying to get nude beaches in greater Seattle Area. Also one of the cofounders is also promoting nude gardening. The logic behind reasoning behind naked bike ride and naturism was kinda extension of cofounders beliefs. They tend to be closer to well nature, naturism isnt to far different from wording of naturist. They started bike ride in ways to promote clean forms of transportation. Also combining nude ride also is way to get attention. Realize that Pacific Northwest in USA and Canada tends to be bit more libral than rest of USA. Nudity isnt as taboo. The Seattle Freemont Solstice Parade is famous for the unoffical start of parade with naked bodypainted cyclists. So having these rides brings attention to both acceptance of nudity and clean forms of transportation.
Also cofounders are also activists. You might disagree with such, but such is needed in naturism. If it werent for activists, african americans wouldnt have civil liberties, and gay rights are becoming more accepted due to the activists. That said what might be appropriate for activists in one area might not be appropriate to another. Likewise activists should be promoting things in non threatening manner. One reason for naked bike ride is when you do things that are pro environment it gets a lot of support at least here in Pacific Northwest.
Last, feel free not to support such, but given that naturist movement has been in many ways decline with lack of younger folks, such is needed. Last year in Portland with full city support there were thousands of naked cyclists most who are younger generation participating. Todays people who dont mind being nude might not want to be called nudists or even naturists, but same time they have no problems being nude and also promoting things they believe in.
Michael