Australia was originally settled (by white people) by criminals and their prison guards, by your analysis we should be a bunch of people who never talk to the police. However this is not the case, most people will happily give the police assistance if they are asked. Whilst dobbing people in directly is not something that is in the culture, generally we don't fear the police.

Could be something to do with the fact that the police don't generally draw their weapons unless faced with violence.

Of course there are areas where policing is more direct and there are groups that have been historically given a hard time by the law, but these are comparatively small.