Holden, you are a master of paraphrasing.
1. I'm not in a position to discuss counter-terrorism operations in a photography forum. Firstly, it's overseen by a specialist department that I don't work in. Secondly, it would be impossible for me to quantify the value of any intelligence gained from stops & searches and subsequent action that may arise from it. Finally, I note your derision at my stopping of a man who had broken (allegedly) through a fence to take pictures of a railway line. Do you not want police officers to investigate anything, or would you rather I drove past and ignored it? Personally, I think such actions are reasonable.
2. Partially true. Unfortunately, most officers don't have the education of a barrister, and don't happen to have a multi-volume copy of Archbold to hand when they have to put the law into practice. Most of us just about manage to keep up, but if you ask me to explain the finer points of the Air Navigation Orders 2005, I might struggle. However, most officers (especially in specialist departments) are very familiar with the laws that their department investigates. If an officer is having difficulty on the street, there is usually other help they can turn to at the end of a radio. But yes, sometimes officers are mistaken.
3. There aren't "plenty of other laws". You've just invented that. I mentioned s89(2) of the Police Act...namely Obstruction, and even provided a link to it. I would be grateful if you could show me which laws someone would break by refusing to cooperate.
4. Yes. If I believe you have committed a crime, I may arrest you. I can rarely prove "beyond all reasonable doubt" at the scene, so you'll probably come into custody while I make further enquiries, and you may be released on bail if it's a lengthy investigation. See my post relating to s24 PACE. I can even arrest you if I believe you're about to commit a crime
5. I quite specifically said I was talking about bureaucratic inefficiencies. The De Menezes case was nothing to do with that.
6. Not quite sure what your point is, but yes...we do listen to the society we police. My interest in being a member of this forum is in photography, but I saw an opportunity with this thread to try and be a bit more helpful and show that most officers aren't as bad as we're made out to be. I don't see society as "them" and "us" when it comes to policing, though I understand concerns about some police actions driving a wedge between the police and the general public, and I have them myself. I could have contributed nothing to this thread and ignored it, but I have stuck my neck out fully expecting to have a very rough time of it; I would rather speak to people than hide. I've also avoided patronising management-speak, politics and regurgitating stories "I've heard".
7. Again, I made that point in response to someone recommending that we conduct training with more outside organisations. It is only Kent Police that train at Canterbury University, and most other forces conduct their training in-house with external speakers and trainers visiting for lessons where they can provide a special insight. I'm sure I don't need to tell you that the curriculum includes far more than just "being assertive". I could expand on this considerably more, but I don't really see the point.
I kind of get the idea that nothing I say is really making any difference, but thankfully your particular derisive scorn doesn't affect the way I do my job. As you sleep soundly in your bed, I am content in the knowledge that I will be going out to help people who need it most, that I will do a good job of it, and that I take pride in doing it.