Board Thread:Naruto Discussions/@comment-26127155-20150222120624/@comment-5407586-20150222125649

Danzo was a war-hawk who believed that in order to gain peace, it was needed for him to become the Hokage and somehow make all the other countries bow down to Konoha.
 * Hanzo and Pain: no one knew that there was a Rinnegan wielder in Akatsuki. Danzo was helping Hanzo in hopes that Hanzo would return the favor by helping the former becoming Hokage.
 * Itachi and Shisui: Danzo thought that Kotoamatsukami was just a temporary solution, and didn't wish for Shisui's power to go to waste, because he thought that only he knew how to use it wisely.
 * Sasuke and the Uchiha clan: as stated above. Kotoamatsukami wouldn't have worked perfectly to keep the Uchiha at bay. The one who made Sasuke become like that was Itachi (with Orochimaru and Tobi's help), not Danzo.
 * Orochimaru: Danzo, as everyone knows, used whatever means he thought necessary to gain more power, and with someone like Orochimaru, who knew quite a lot about body modifications, he had a great ace up his sleeve, though in the end it backfired when Orochimaru became a Rogue Ninja.

With this, I'm not going to defend Danzo. He may have died for his so-called "peace", but in the end he did what he did only to gain power. It doesn't matter whether he seriously wanted to bring peace to the world.