I think the point that has been abundantly made is that they can....and do ask for ID....and we have said...and said again in many cases you are not required by law to provide it although it is usually a MUCH easier route to take.That is a good answer to some question, but not the question I was asking. We were talking about situations where there is no reasonable suspicion or PC for a detention or arrest. I know we have to give ID upon arrest.
The answer here may be that Police simply aren't going to ask for your ID unless you are being detained or arrested.
Your view is simply that you are not going to do anything that isnt absolutely required by law. That is fine and your choice, it simply doesn't accomplish much except to alienate you and do a dis-servce to your cause (2A in this case). I have asked for ID literally hundreds if not thousands of times from people who were not detained nor arrested. It wasnt training or policy, simply an easy way to remember who I talked to about an issue. Its not near as big a deal as you make it out to be.
I understand you like to disect law, but what are you trying to prove?