I completely disagree, and I don't even carry any of that stuff! Its not about being a wannabe cop, its about being prepared for anything. Sure, some people out there are wannabes and do the whole utility belt thing, but i think most people here wouldn't fall under that heading.
Pocketknives are probably the most common thing in someones pocket after keys, phone, and wallet. I dont generally carry a knife, but i can see how the more you carry one, the more uses you can find for it. (think about the movie 127 Hours, that guys knife came in REAL handy.)
Flashlight i don't really see the point for an EDC, but i think thats more of a MacGyver thing than a "mall ninja" thing.
And a spare mag? If you have a problem with carrying a spare mag, why don't you have a problem carrying the first mag in the gun? or the gun? Its preparedness. I know its not necessary, but i don't think any less of someone for carrying them. I try to carry an extra one, but most of the time I don't.