system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the big reason that we NEED a manned Mars mission?

I don't understand the necessity of putting a man on Mars. We've sent numerous probes and rovers, what else could a human find that is so necessary? There's nothing valuable there we know of and costs really seem to outweigh whatever benefits there are.
gpt
It's science for science sake.

This is exactly the type of endeavor we should be making.

We came down from trees.  We came out from caves.  We climbed mountains.  We crossed oceans.  We took to the skies.  We went to the moon.  Why should we go to Mars? Because it's there.  That's what we do.