In Chinese traditional culture, to write poems or paint on places or buildings or something, is some kinda, honor(?). And more famous persons's writing or painting, more famous the place to be. Then, the words or paints became important components of the place. It looks not shame, or bad but some behavior of culture.

Even one place is known by few people or none, or landscape is not attracting, if some well-known person defaced, then it will be well-known and be attracting.

Chinese belief in that nature and culture should be harmony. Later travelers come to see not only how beautiful the place, but also the marks left by whom, and how the words and paintings effected people to evaluate the place.

Now, people think to do so is damage the place.. It's bad, people who did that will be punished.

My point is, anything illegal, should be punished or maybe then discussed. If not, should be discussed.