It appears to me that the alleged connection between Yankees garb and crime is really a reflection of the popularity of Yankees garb. Support for that hypothesis can be found in the Times piece, which found that the number of suspects or persons of interest arrested or arraigned dressed in Mets finery over the past 10 years was "about a dozen." This correlates pretty closely to the overall popularity of Mets garb versus Yankees garb. In other words, criminals seem to pick their colors in the same percentages as noncriminals.
Finally, if Yankee caps and jerseys are so ubiquitous in New York and elsewhere, could it be that the criminal element has adopted Yankee gear as a disguise that makes them completely nondescript?
This story is a swing and a miss.
Note to New Englanders: Wearing Yankee colors within 100 miles of Fenway is against the law. Or so I'm told. File your criminal complaints at firstname.lastname@example.org and visit the court I run on my Twitter feed. I'm a hanging judge. (E-mail may be quoted by name in "The Fray," Slate's readers' forum; in a future article; or elsewhere unless the writer stipulates otherwise. Permanent disclosure: Slate is owned by the Washington Post Co.)
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