Originally posted by Inoplanetyanin
OF COURESE! If there are tool to CUT the steel BODY OF THE CAR in a HALF, often in only several minutes, there ARE going to be tools to remove some bicycle lock, it's just not all of it can be used in front of the store, without getting someone's attention!
You seem to assume that if the thief catches someone's attention, that someone will take action that will prevent the theft of the bike. While this is a possibility, I would think that it is unlikely. How many people will put themselves at risk simply to stop the theft of some bike? I would expect not many.
The best strategy is to make it not worth the thieves time for the value of the bike. If you have a 30 year old Schwinn protected by three separate locks, you're probably not going to run into trouble. On the other hand, if you have a brand new $3000 carbon fiber bike, you're a fool to let it out of your site on the street of any large city - regardless of the number of locks.
Two simple technologies that should make short order of any bike lock: Cutting torch and disk grinder.