It’s a crime to deface graffiti...er...street art? I thought the people own the walls that are defaced and that is why this is allowed in the first place (their logic). If that is the case, then there is no crime because one cannot be charged with defacing ones own property.

If unsure, view for yourself https://www.webcamtaxi.com/en/vatican/vatican-city/st-peters-square.html

It needs to be seen. Just like Holocaust. Otherwise there will forever be deniers.