But its just an idea.
The idea of being able to harm or to kill people as a basis for the practicing of Aikido does not neccessarily find an expression in the "real" skills that somebody has.
Exploring what one is willing to do to defend oneself is essental. The time to do it is in quiet meditation not during a conflict situation.
During conflict it is so important to have mind and body co-ordinated and to be able to trust the ideas that surface from our inner selves.
I think that we are talking around the same ideas.....the question is what are you willing to program into your "tool" set that will be available in the moment to be used dependent upon the situation, with the situations differing and utilizing different tools (responses and respond levels)?
I think that the problems we get into here is, as the old song goes...."....what to leave in and what to leave out...." Many here preclude the use of some responses and tools, never train them or program them in. If you need a rope and didn't provide for one it is not there if needed.
Having said that everyone is free to train at whatever level they choose and to include what they choose.