na, it's more anti-authority us v. them than it is "how can I be most effective at helping others". cops can sometimes be a pain to skaters, and cops can sometimes be a pain to illegally parked cars. The less times the cops win, the better.
Yup pretty much this. Any benefit to the car owners was purely a happy coincidence. I'd say the homeless guy mentioned above (and know for a fact others who did it in the same area/era) were doing it for the same reason.
Ideally the authorities are working to achieve efficient use of parking space and funding for local government. I suspect such "anti-authority" protestors are not really informed enough to make a reasonable guess as to whether their interventions will be a net benefit. As is, to me, it just seems like people messing with the system because they can't compare the abstract benefits of increased parking efficiency, to the more obvious costs of someone experiencing the displeasure of a parking ticket.
