I would need quote on the 'vast majority' claim. You can't leave a bike for 10 minutes in downtown Seattle for a reason, homeless heroin addicts gets their drug and resource to procure those drug _somewhere_.
I have left my bike unlocked, and even my automobile unlocked with its keys in it, many time and never been burgled. (Once in Boston my bike accessories were stolen off my bike.)
Even if every bike is stolen by an addict, that doesn't mean most addicts are doing the stealing.
