I saw a recent report on the Parisian bicycle system Velib. I can't find the news story (search engines can often be crap). The problem with Velib
is that many of the thousands of bicycles are returned daily in damaged
condition, so damaged that the constantly circulating bike maintenance
teams can't make adequate repairs without taking the bikes into their
shops.
How is this possible since a
credit card is required for non-Parisians to use the bikes? Two
reasons: one the public is not very nice and a significant percent of
the public will mess-up anything (think graffiti) if they can get away
with it. 
All you eco-fiends and do gooders would do well to examine this reality.
Two, the French in their unceasing demands for "privacy" have made it a law that credit card transaction must be erased a few hours after they are completed. So the bicycle destroyers can get away with their destruction of public property, without being caught, once they know the French laws.
Obviously scofflaws have good communications systems and are able to tell each other about the fun of destroying Parisian bicycles. ...unhampered.