There are two ways to destroy culture. One is by putting things into the culture that are not healthful. In other words by polluting and/or poisoning the culture either physically or intellectually.
The other is by taking more out of the culture than it can afford to lose and still remain stable. In other words by unregulated, culturally irresponsible resource harvesting and/or profiteering.
Both processes are rampant within the U.S. and elsewhere at this time.