Yeah, quite a brutal scenario, but we have actually seen references to such before. Disaster of Questions took part in destroying the world where the guides came from, in the previous, long scenario.
'Genocide' in the victory condition is going to be a bit of a challenge to circumvent. Wonder what the MC has in mind. And yay for total sociopaths </s>. Surprised the scenario isn't "Go Gargamel on these Smurfs. Kill 'em and cook 'em and eat 'em", sheesh.