Using your logic, then dara should not be able to have a booth at Friedrichshafen, nor Tokoyo Ham Fair, either, correct?
There have been many booths at hara in past years that "didn't exactly fit amateur radio." One of which was "lock pick sets." Someone buys a set, and starts robbing houses in Leeds, Alabama. When police find the guy, he tells them he bought the pick set at the Dayton Hamvention.
How about someone in the flea market selling red/blue lights. Is dara "encouraging" people to buy them so they can impersonate a police officier? I can see it now. Young woman gets pulled over by a "police officer," gets raped and killed. When they find the guy responsible, they ask him where he got the lights. "I bought them at the Dayton hamvention." If I were the parents, I would SUE dara for that.
Are guns not ham radio related? No? Then why have I seen them out in the flea market - for sale?
And the flea market rules state that dara can "remove anyone for selling non-related amateur radio equipment." Maybe dara should start enforcing their own rules rather than putting blinders on and counting the money that they get from people selling stuff that "doesn't exactly fit amateur radio."
Maybe in 2017, we'll see less Motorola HTs from the 1980s with a multi-auto charging unit, three phase lasers, and other garbage that should have gone in a dumpster 20 years ago, and more stuff that "fits amateur radio."