Jurassic Park is taken from the book by Michael Crichton. He wrote lots of thrillers about uncovering dangerous or hidden truths, a small person fighting a giant system, etc. It sells well. I'm not sure I would give Spielberg too much credit on the underlying themes of Jurassic Park. He's out to make blockbusters, and face it... realistic, scary dinosaur doom SELLS.

Either way, I'll be interested to read your take on the movie. Enjoy.