I don't know why you feel it necessary to use big shouty letters to emphasise the "Innocent until proven guilty"
I think that phrase applies to the legal process and not to the expected response by armed police to their perceived threat when dealing with a situation.
You mention the table leg scenario. I actually know a little of that case. Mr Stanley who came from where I was brought up. was a convicted, violent robber and a thug. He did not drop the table leg when instructed to do so by armed police who then shot and killed him. They believed he had a sawn off shotgun.
Other people who saw the table leg also thought it was a sawn off shot gun and called the police to that effect. The person with whom he was having a dispute with over an unpaid debt was also informed that Mr Stanley had a sawn off.
Anyway, in the Stanley case, despite several enquiries having taken place, the officers involved have not been subject to any charges or legal process.
As far as the Mini incident, I know nothing of that case and there is a danger that any research I do could result in me reading a report by a Daily Mail journalist which may not be factually correct.
I am still trying to find any incidents when innocents were shot dead by police officers who had questionable levels of mental health.