I knew I'd read this somewhere . . .
Chida, like most of the top sensei, thought self defence a little ridiculous. They were interested in principles, abstract secrets of the human body that could only be studied and learnt through " pure" aikido training. Of course in any "self defence" type situation these same sensei would be lethal . . .
I think you can validly practice Aikido to study the principles involved without it leading to degeneration or dancing.
Now, if you'll excuse me, there's a mob outside my house, waving pitchforks and burning copies of "Angry White Pyjamas".