Board Thread:Naruto Discussions/@comment-18016240-20160208110013/@comment-681696-20160210164136

Tobirama's plan for the Uchiha worked for decades until a member of the Uchiha clan attacked the village using Kurama, then people started to rightfully suspect that a member of the Uchiha clan was responsible, and the Uchiha clan who were besides Obito entirely innocent of the crime were offended of the idea one of their own was responsible of the attack, which caused both side to start to dig up old grievances that have been forgotten and creating new grievances ruining the progress made over the decades.