Astronomers would rather have simply developed these systems for peaceful uses, but they could hardly turn down the gift when the military declassified the technology a few years ago. I teach and write because I want people to know more about astronomy, and I hope they'll catch at least a passing when they take my class, or when they read a book or article I've written, in the fascination of learning about the universe. I'm not even sure it's a good idea to spend the money. I, for one, think it's an endeavor in overblown heroism. Maybe we'll go to Mars someday, but I think, at least for now, the money would be far better spent on unmanned planetary exploration.
Many people think it's invested too much.
I think, for instance, that too much has been spent on the space station. We already have nuclear submarines.