Im gonna agree with this guy.The Uchihas could break out of Tsukiyomi quite easily.... That's my guess anyway.
not quite easily. But if anyone has a chance of breaking out, its them. So Obito had to eliminate all the threatsThe Uchihas could break out of Tsukiyomi quite easily.... That's my guess anyway.
Well Itachi was ordered too, and I think Obito offered to help in the condition he joins the akatsuki. Makes the most sense to me. I think actually Obito was indifferent to the whole thing...
These are the reasons he helped.To get more Sharingans for his collection duh.
They said this was a reason in the manga.They were eliminated because Konoha saw them as a threat, and the only other option was a civil war.
This^^^^^^^Simple, Uchiha were an immediate threat against his plan because they seemed to be capable of breaking free from Infinitive Tsukuyomi. Also, by doing this, he was capable to gather a lot of sharingan to strengthen himself.