This post has no redeeming social benifit

My original caption was, "This is what happens if you sit still too long in California." 
Back in 1991, I was in Southern California visiting relatives and driving along one of the many freeways in Los Angeles I notices there was razer wire around the freeway over passes and around freeway direction signs.  I was told it was to keep gangs from "Tagging" road direction signs.  As trains pass through our town it seems like half the boxcars have some form of graffiti  on them.
Why do people feel the need to spray paint words on public and private property that does not belong to them?  There is not one once of social redeem benefit from this action and yet it has been going on for millions of years.

In Utah, hundreds of years ago, native Americans or American Indians carved messages in picture form on sand stone and now we call them  "Native American rock art" and it is protected by law.

I guess it all in the eye of the beholder.  Maybe one day today's gang Tags will become a national treasure....who knows the way things are going?