I think he meant why Scranc, Bashrag, and Wracu - hence the note of beyond the Inchoroi.
Hrm, that's not how I read it. Anyway, Bashrags and Wracu don't seem to be obsessed with sex or rape, Skuthula's rather... odd dialogue notwithstanding. Sranc and Skinspies certainly, but I'm guessing that's a relic of "when you're holding a hammer, everything looks like a nail" on the Inchoroi's part. They're obsessed with rape and they've managed to destroy countless worlds. Being obsessed with rape works, makes you really good at genociding! Of COURSE any weapon races we create should be as rapey as we are! And FFS Aurang, would it kill you to put some bigger phalluses on those Skinspies?
They did use nukes, per TUC glossary against Nonmen. And they did use disease per the Womb Plague. But at a certain point, they could just fleshcraft beings. And the best for them were beings already designed to want to kill. Even lust for it.
Yup. If you're creating disposable weapon races to release upon the world, makes sense that they're into violence. Peaceful tribes of sranc doing their own thing in the hinterlands aren't of any use to anybody.