Question: tokyo ghoul why did kaneki join aogiri?
Answer: The main reason Kaneki joined Aogiri tree is because he wanted to keep an eye on Aogiri's activities and if it ever was a threat to Anteiku he'd destroy it. ... Kaneki is similar to Itachi from Naruto, where Itachi joined the Akatsuki just to monitor and keep an eye on them to protect his village.