Lol! Good initiative by the people, but I feel that such parades do very little to help out of control gamblers fight their addictions. What truly matters the most is inner willpower in these cases.
The ones that posess strong willpower can overcome their gambling addiction while the ones with weak willpower will probably never overcome this issue.
I think that it can`t help. The parade will attract attention and popularize slots. Even if the organizer thinks differ. No one need such parade except someone, who get profit from it. Someone interest, someone decide that he hasn`t any problems with gambling. And as result we get new addicts.