Well, we didn't believe them that their AI can make deadly bioweapons when they already showed clear indisputable evidence (the AI passing a biology multiple choice test), so clearly they need to have it make actual bioweapons so we'll take the threat seriously!
Edit: had a thought
T-Virus
I mean rationalists, particularly the e/acc breed, would probably count the T-virus as a success. After all, wasn't Umbrella corporation able to study it and come up with some really powerful transhuman augmentation for their various leaders? Just overlook the part where it turns you into an insane monster ... I could easily envision someRationalist fanfic of Resident Evil portraying Umbrella corporation as misunderstood anti-heroes...