Board Thread:Theories and Speculation/@comment-3001903-20160813042916/@comment-734582-20160825161417

Caseather wrote: Since the Mangekyo Sharingan is capable of controlling Tailed Beasts, why didn't it cross Konohagakure to seal Kurama into an Uchiha with the Mangekyo Sharingan in an effort to control the Fox's power? Isn't the simple answer to this that the Uchiha weren't trusted enough?

It was an uchiha controlling the beasts that led to Hashirama capturing the beasts in the first place.