The fourth generation is not dead. The reputation of the previous four generations was not good. The fourth generation released the Nine-Tails because he wanted to gain power. Later, he could not control it and had to seal the nine-tails in his son. On the body (Naruto). The fourth generation is Akatsuki's boss - Qinglong. He also invited Jiraiya and Itachi to participate, but Jiraiya didn't agree. The fourth generation threatened Itachi, so he killed the Uchiha clan, and Itachi only The reason he could tell Sasuke that he did it was to make Sasuke stronger in hatred and defeat Akatsuki! It wasn't until Sasuke defeated Itachi that he knew the truth. The last four generations were defeated by Naruto