I take problem with Steven Hawking's assertion that we shouldn't talk to Aliens. If they were able to travel across solar systems or any number they would easily be able to end humanity. If they are attempting to talk they likely aren't interested in killing us all but rather in the cultural and intellectual exchange we could have.
I am sure any species that finds us and comes to us and doesn't immediately destroy us would be looking for knowledge just as we are. I would be willing to assuming that most, if not all, intelligent life is curious. Curiosity might just fuel and cause intelligent life.