Devil's advocating: I read Wilbon last week, and was ready to rip him, but part of me says, "You know what? Wilbon is unashamedly a native and fan of some teams and people, he's reasonably up front about it, and who says every single sports writer has to be a hardass and aloof and 'objective' (whatever that means anymore)."
It's not like he has a hidden agenda here. So part of me says, "That's who Wilbon is, and so be it."
So you take what he writes about certain Chicago topics for what they are, and treat them as hard-edged reporting at your own peril.
I know this is a problem for many, but if you really think about it: Why? He liked Walter Payton, doesn't think the book was necessary. OK by me. Not like it's going to hurt sales or anything.