system
Given the following post, respond as if you're commenting on Reddit:
human
[Galaxy Quest] A group of actors from a cancelled science fiction show have killed an intergalactic warlord and established first contact and all they get is their show renewed?

I don't get it! Sure, I guess they're actors and aren't exactly qualified for the true blue nitty gritty of interstellar war and exploration, but all they get is renewed! It'd be like if Firefly was renewed because Nathan Fillion rescued the Alpha Centaurian slugs from the Praxian toads! 

And another thing, if they just killed the eponymous Saris of the Saris Dominion, have they not allied themselves with the naïve octopi aliens and started an interstellar war with their shenanigans?

Not to mention the implications of the Thermians building a fully functional replica of the ship from the TV series just by watching the series! Are they reality warpers? What the hell is going on?!
gpt
They got their show renewed because that's what they wanted. They don't actually want to risk their lives running around space fighting the bug-headed flesheaters of Procyon VI. They want to get adored at conventions. 

The Saris Dominion fell just like most Earth empires fell after the leader in a cult of personality died. It helped that their flagship was destroyed at the same time. 

As for the Thermians, well, they are the very definition of "book-smart vs street-smart"