I've been thinking a bit more about this. I somewhat agree with this as a PR campaign to get people to think more about there actions and not fill up the southwest with "Rock Art". I definitely agree the actual ecological destruction (digging up river beds for rocks to stack) needs to stop. I still think there are more pressing needs in our national parks than stacked rocks. I view this rock stacking like loud music in the parking lot. I find it annoying and inappropriate, but if you pick up after yourself you don't come anywhere near the top 10% of worst offenders in our NPs.