An Uncomfortable Truth
Did anyone notice that all those dismal City of Chicago crime statistics came during the time of total firearm ban in the City of Chicago? Likewise, when one examines the statistics of States like Kommiefornia, New Jersey, Maryland, and the like, that so restrict carry permits that they might as well be called "right denied" States, the data support the conclusion that less personal firearm ownership results in more violent crime.
My personal belief is that the Democrats in Chicago want to keep anyone from owning a firearm so that the decrease in crime rate that was documented after Heller v District of Columbia won't show up in the Chicago statistics. That might be way too uncomfortable and a pro-2nd Amendment candidate for Chicago City Alderman, whether democrat or republican, might actually get elected. (Keep in mind that DC had onerous restrictions post-Heller too, but crime still went down because the bad guys didn't know which households could afford the new permit.)