Why? Assuming no one wants a pie that's 9 feet across and served at 2700 degrees, then there's no reason to ban them. But on the off chance that someone might want such a pie, the government should have no reason at all to restrict their right to one. I'll point out that there is no current ban on 9 foot wide pies served at 2700 degrees on the books
Actually you can't serve food above 500, but that's not important. What's important is if there were big hot pie spree killings happening, the idea that the Little Debbie corporation would fight tooth and nail to preserve big hot pie rights is batsh*t insane.
The larger point is that there is no "doing ABC to firearms is like XYZ" analogy that works, at all. They are a special case, hence their specific mention in the 2nd amendment. In our law and culture they are a unique case. Argue the merits of the actual unique case. Now, don't get confused. Analogies used to argue that they *shouldn't be* a special case work just fine.