Graffiti - Expression or Disrespect? - Van Trip Part 3

Graffiti, It's been going on for years, but is it an expression of a supressed section of society or is it a damn right travesty and lack of respect?
In parts one and two, I detailed sections of my van road trip and the exploration of some WW2 defensive structures. Once inside, I found they were all decorated with graffiti and sponsored 'art' - In this case, some welded words in the window of the lookout tower. The meaning is a bit cryptic to me?

In some respects I can appreciate the art that has gone into some of the murals.Amongst some of the 'art' (term used loosely), are some strange 'tags'.Other pictures are of an amatuer standard.I am surprised that no one has bought these buildings and refurbished them.

In my opnion, this is a series of blasphemous acts, disrespecting our heritage and values.