They might tell you that you are destroying the power in the world. So treat these places as you would like other people to treat things which are very important to you. Non-Indians are only just now beginning to understand the significance and importance of rock art sites. Obviously, contemporary ethnography and historic research needs to be done to determine the identity of people whose names are chiseled at rock art sites. Just because there are names chiseled on the rock at this site, does not mean that this is necessarily the vandalism of some modern day miscreant.
Nothing is obvious when it comes to rock art.