Board Thread:Wiki Discussions and Support/@comment-142748-20141231093731/@comment-1018594-20141231201728

I don't think the Uchiha were flat-out discriminated against. Tobirama was wary of them and thus limited how much they could be involved in government affairs. It was rumored that the Uchiha were behind Kurama's attack because none of them were seen to have assisted in defending Konoha, and an Uchiha was known to have controlled the beast.

Fugaku took that suspicion the way Madara would have taken it: ZOMG THEY WANNA KILL US SO WE GOTTA KILL THEM FIRST. And that's pretty much how the massacre came about. In a way, Danzo offered the only viable solution: either you can wipe them out and avoid a civil war, or we can pretend that everything's alright and stick our asses out for an inevitable coup.