Actually it does make sense if you include this part.
http://www.onemanga.com/Naruto/399/02/
http://www.onemanga.com/Naruto/399/03/
http://www.onemanga.com/Naruto/399/04/
http://www.onemanga.com/Naruto/399/05/
http://www.onemanga.com/Naruto/399/06/

Madara's brother had apparently just agreed to give Madara his eyes just for the sake of becoming strong enough to protect Uchiha and then the Uchiha agreed to a peace treaty with their greatest rival. Then when Hashirama was chosen as Hokage and Madara opposed him, instead of acknowledging all that Madara had done for the Uchiha and supporting him, they chastised him for the very actions he had taken to protect them. All things considered it's had to imagine anyone not feeling betrayed in such a situation, because it meant that everything he had done had been for nothing and in effect his brother had given his eyes and his life for nothing.

http://www.onemanga.com/Naruto/399/12/
http://www.onemanga.com/Naruto/399/13/
Yeah the Uchiha started to come around to Madara's point of view but it was only after Madara was defeated and the Konoha Military Police Force was formed that the Uchiha began realizing that Madara may have been right about the Sengu. But as Madara said, by then Uchiha had already lost too much influence so it was too late for them to do anything.

I think Madara's story is probably some of the best writing Kishimoto has ever done. I still can't say for sure whether Madara was right about the Sengu or if it was only Madara's suspicions of the Sengu and his subsequent actions that lead to the demise of the Uchiha. Regardless of whether he is Danzo or not we know the Uchiha massacre was a direct result of the Kyuubi attack sixteen years ago which Madara was responsible for, and we know that Madara himself took part in the slaughter. But it's hard to say whether something like that wouldn't have happened eventually even without Madara pulling the strings.

Actually I can say that Madara probably has had some part in every single thing that has happened in and outside of the village since he was first defeated by Hashirama but what would be the fun in that.