But it doesn't. A tourist is by definition nomadic, just there to reap some short term benefits regardless of the community's long term commitments and trade-offs. Some of them may be altruists foregoing the more destructive pleasures, others will be 100% self-centered and grab everything they can without a single fink given. There is some carrying capacity under which the impacts can be absorbed without straining the community. Above that it can only end into a race to the bottom.