Some people may not find profanity offensive, and that's the crowd who would most likely buy those t-shirts, but they should still be hidden from view in stores, and be kept in the back. The mayor, who was offended, did not COMPLETELY ban those t-shirts and other souvenirs, but restricted them to those 21 and older, and had them hidden from view.

Another solution would be to open a store that only sells these kinds of t-shirts, and not allow anyone under 21 to go inside and see the shirts.