Is there not a basis by law that the secondary graffito was as illegal as the first? While Banskee is the popular choice of trendy pink elephants [see 'controversy' in LA show] there is really nothing special going on here.
If they persecute the two old guys then they must also persue the original infractor, a mr. Bansky.
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See what other swarmers have to say about it. People love this place, so I feel fine about sending you there and am confident you will enjoy boners.