Still think that's really a stretch. They know Cyclops pretty well. Do you really think they would accept that he would willingly release a plague that killed mutants and infected humans? When Cyclops confronted Wolverine in All-New X-men when he recruited O5 Angel, he dared him to kill him where he stood if he thought he willingly killed Xavier. But he didn't. Because even Wolverine knows on some levels that Cyclops wouldn't do something like that willingly.
So I have a hard time believing that any friend who knows him in any capacity would believe he would willingly do something like this. Even at his worst, he values mutant and human life. That never changed, even during AvX.