The question not even asked by the article is ... why?
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E.g. Boston had 1,575 reports of auto theft in 2012, compared with 28,000 in 1975; Massachusetts had 242 murders in 1975, and 121 in 2012. (a 56% drop in homicide rate, as population went up 14%)
Are there any aspects of the crime that make it less appealing? Electronic counter measures too good? Price of replacement parts no longer carry a premium? Too easy to get caught?