I don't believe Hitler was a bully that was crying out to have someone stop him.
All good diplomacy has been backed by a strong infrastructure to include military power or the will of the people. You could call this the life giving sword. Walk softly and carry a big stick comes to mind. Name one country that did not use the will of the people to back up diplomacy. India under Ghandi's leadership did so without a strong military, however, it was the will of the people and the ultimate threat that. However you could argue that this technique worked given that there were unique conditions in place polictically with Britain that enabled this to work. It didn't go so well for Tibet and I have heard the Dali Lama relent his position and decision knowing what he knows today about the suffering his people have incurred.
It boils down to the "lesser evil" in all cases unfortunately. So, IMO, it is always about compromise mostly. Again, what worked for India did not work for Tibet based on the differences in the Diplomatic and Political conditions. Idealism is fine, but at what cost?
"The history of peacemaking far outstrips the history of wars by number and victory. Those who do not see this do not see what Ueshiba was saying either in my opinion. But then again how can many understand such enlightened views when they are not. "
Please explain this further and quantify it, because I really do not understand it. I see it the other way around. the Majority of peacemaking situations have followed periods of war and the war certainly influenced and dictated the terms of peace and reconciliation.
A fair question. Let's start with Aikido being the path of peace. Therefore it uses principles which do so. Thus applied it changes what could have been a fight, a combat, a war into something else.
Now in life just look around you and relate to your own experiences. The truth is there for you to see. How many minor arguments have you seen or had, how many minor disputes have you seen or had? How many times, if you have children, have you settled differences between them. All minor that without settlement would progress into major. So plenty of bigger troubles have always been nipped in the bud, every time this happens it's a victory for peace and common sense. Those unhandled ones turn into war. Then your left with how to handle chaos. That's the last stop.
The principles in Aikido which include for example compassion have been talked about and demonstrated by all enlightened or even just aware people including all those you mentioned, be they Mother Theresa et al. They went out and demonstrated the power of such. Then alas the majority of people don't get it but boy do they talk about it whilst doing the opposite.
For me Ueshiba left a promise in saying what he said. His promise was that these things actually work if you can get them real enough, it's up to you.
Such is my view, open to debate of course.