Too much traffic on National Seashore

We spent the first day of our Texas vacation on Padre Island National Seashore. After reading the description of the National park on the Internet, we expected the barrier island to be a bit like Assateague National Seashore in Virginia/Maryland. Abundance of wildlife, nature, endless beach, crashing waves, and not many signs of human presence.

"Padre Island National Seashore is the longest section of undeveloped barrier island in the world, protecting rare coastal prairie; a complex, dynamic dune system; and the Laguna Madre, one of the few hypersaline lagoon environments left in the world…. Situated along the Central Flyway, Padre Island is a globally important area for over 350 migratory, overwintering, and resident bird species… Padre Island National Seashore is the most important nesting beach in the U.S. for the Kemp's ridley, the most endangered sea turtle in the world.” (http://www.nps.gov/pais/index.htm)

Well, we did see many birds, but we also had to put up with traffic and the trash left behind from hundreds of beach campers over the 4th of July weekend. From soiled diapers, empty beer cans to leftover catch.







I'm wondering why the entire Padre Island National Seashore is open to car traffic? Why not only a limited area, so that the rest can be unspoiled nature?