Originally Posted by
Digital_Cowboy
That's why I carry two locks as well. I figure that most bike thefts are a crime of convenience, i.e. they're someone at the mall, store, park, school, etc. who is too lazy to walk home and are looking for an easy way to get home. Or they're a junkie looking for something that they can "fence" easily to get their next fix. And therefore they're likely to only have the tools that they need to defeat one type of lock.
The only thieves that'll have the tools to defeat multiple locks will be the "pro" and sadly those we can't really do anything to protect ourselves from as they are determined to get what they want.
That's what's cool about living in El Paso, TX - a city with little to no bike culture. People here don't know the difference between a Wally BSO and a $5000 Pinerello, and there are no pro bike thieves - there's no market and not a lot of bikes available if you're prowling. Nobody wants my middle-of-the-road Trek mountain bike except the "crime of convenience" that you mention - and my locks are bigger than those people. Viva El Paso!