Jennifer wonders why they didn't sack her after "The Shrine", but there's the part where Rodney destroyed a solar system and managed to stay employed

"He destroyed a solar system." "Mere-dith!"

And, well, the gang is kinda both directly and indirectly responsible for the deaths of tons of people, both due to releasing the Wraith and reprogramming the Replicators

(though to be fair, they couldn't have foreseen the latter happening)