User blog comment:Oknight/Hello Megan -- Red Tornado is the double agent!/@comment-167456-20110313090705

Well, the whole purpose of "Welcome to Happy Harbor" was for T.O. Morrow to reprogram Red Tornado and they failed. They didn't have another opportunity between that episode and "Infiltrator", when they said they had an operative on the inside.

As for why Red Tornado is there, he fulfils the role of caretaker. He's really the only member of the Justice League who could do that. You could argue that the team doesn't need caretaker... but I suspect this is an argument that the Justice League wouldn't agree with.