Myth of Gun Control?

Today's NY Times has a column by Timothy Egan that purports to debunk the notion that more guns leads to less crime, which is John Lott's compelling thesis, updated periodically in new editions of his famous book (More Guns, Less Crime).

Mr. Egan cites a couple of studies, which I'll happily admit I haven't read more than the abstract.  However, he also cites two anecdotes to support his case, both relating to the Tucson shooting earlier this month.