I generally agree.
I would also suspect that the police officers recognize that if the recording shows the first words out of their mouth sound professional and reasonably polite, then they are home free in the eyes of the jury if the suspect suddenly seems hostile. Sounding professional and polite is also likely to illicit less hostile responses.
For most police officers, this is no change in behavior. But there are surely some marginal individual officers who will build better habits when they see how it serves their personal interests.
Not a single part of your statement here regarding bitcoin investing is any less risky than investing in the stock market backed with USD, which ironically is where most people put their retirement nest egg.
You are employing a double standard in an attempt to create a false equivalence. For the dollar, the general stockmarket, the US GDP, dropping more than 10%-20% is an unusual event. It is not perfectly safe, but it is very safe if you are willing to accept a modest amount of downside risk. In contrast, we see extreme hyperinflaction and hyperdeflation all the time, and the bounds of risk are clear as mud.
Yours is the important point. Germany could only win the Battle of Britain by adequately protecting the various bombers they had on hand. A high speed interceptor might have a lot of value to the RAF, but only very limited value to the Luftwaffe while flying over England.
The Luftwaffe's mission was not to shoot down RAF craft. Its mission was to cripple the RAF AND maintain a bomber force that could smash the Royal Navy. Shooting down every single British plane matters little if the German bomber force crumbles.