Isn't that what war is all about? Boys and testosterone? It's that simple. Boys and toys. Someday we will advance as a society beyond that, but who knows when that will be.
Guess one can say, "hey we need this to advance our science, war is the big experimental space."
Don't really seeing Elon Musk doing much war planning. He does seem to be getting us to Mars just fine.
The amount of $$$s spend building one ship could probably build a heck of a lot of hosptials and universities, all around the world, but guess that would be just kind of boring.
There are still many people in my Brooklyn 'hood that can't read and write. Think that would be a far better mission, AKA Education. But just my opinion. Maybe we can do both?