Why do astronauts get defensive when questioned about space missions?

The space missions are typically fake and done in the texas pool broadcast area instead of outer space.

Abuse recorded 🎥

You need a good memory to be a liar.

I'm sure they've been told to keep quiet about some of the things that they know or that they've seen or experienced. Whether military 'secrets' or other things that mother government doesn't want 'the public' to hear about...