Or maybe...

"Let's turn off the stealth systems and see if they keep regarding us as divinities like they did thousands years ago, keep attempting to shoot at us like they did in the last 50 years, or have evolved in the meantime therefore they're now ready to be welcomed in the galactic federation. Although from watching their entertainment and news feeds I'd bet this starship they won't be in another 3000 years".

That seems like false causality to me. If you or I made a really cool drone that could move that fast and be a major breakthrough in inertia, velocity and acceleration, would you bench it for 40years until you could make it invisible or would you test it out?

Unless they wanted to be seen as to observe our reaction.

Intelligence in one area doesn't mean intelligence in another, it may also be that they don't care about being spotted.