Why did Itachi join Akatsuki if he was good?

Itachi Uchiha was one of the most powerful Akatsuki members and one of the very few who came from Konohagakure. He was forced to join this organization as he killed his entire clan for the sake of peace and then fled the village.

Is Danzo working with the Akatsuki?

During the Third Shinobi World War, Danzō agreed to provide aid to Hanzō of Amegakure in order to receive help in claiming the title of Hokage, sending some of his forces to deal with Akatsuki, but they were all wiped out by Nagato. Danzō enlists Kabuto into Root.

Why did Itachi join the Akatsuki?

Itachi, as a character, is so well developed in Naruto, that there are several layers to his actions. Alone, he hoodwinked the rest of the world, in order to make it a better place. The Elders of the Leaf Village did order him to infiltrate the Akatsuki and serve as their spy, true. That was his official reason to be a part of the Akatsuki.

Why did Itachi have to kill his entire clan?

When Itachi had a meeting with Danzo, Danzo told Itachi he had two options, either side with his clan or side with Konoha and his little brother (Sasuke) will be spared (Which to him were impossible choices) Itachi in the end chose to kill his entire but in order to do so he needed help because he knew he couldn’t do it by himself.

Why did Itachi choose to side with Konoha over Sasuke?

The reason why is because he had no where else to go. When Itachi had a meeting with Danzo, Danzo told Itachi he had two options, either side with his clan or side with Konoha and his little brother (Sasuke) will be spared (Which to him were impossible choices)

Did Tobi have to fight Itachi to get him to join?

In the OVA in Naruto Ninja Storm 3: Revolution, Tobi explains that he will bring Itachi in himself as a recruit, instead of siccing Pain or Konan on him like he does Sasori and Kakuzu. It implies that he did not need to fight Itachi to get him to join.

https://www.youtube.com/watch?v=xxD1Z5QRL1A