retrocop - // I believe that most people in the UK are pretty clued up in how one behaves when having an interaction with American Police Officers. //
Unfortunately, that premise does rely on the presumption of common sense and intelligence on the part of anyone interacting with the police.
Sadly, by definition, the people interacting with the police at the level of confrontation where guns are likely to be in play, possess less, if any, of those necessary personality traits.