Potential recruits to the Filth sit psychometric tests these days and if you possess a sense of humour OR any degree of empathy, you can't get the job!
You have to have no colour vision, because the whole world is black and white when you're "on the job".
Police are managed and measured on criminal convictions, and there's no way to prove a statistical reduction in crime in any area via proactive policing (like they do in some LA counties to great effect...) That's why there's no discretion and no positive role model as in the seventies and eighties. Now it's collar the crim adn prosecute no matter what the case because we don't get costs awarded against us...
Let's face it, if you were bullied at school and you want to get your own back on society, you're motivated to work with those people, doing that job, for a pittance...
South Australia's ICAC finally recommended criminal charges against a Drug squad run amok, aggravated theft and abuse of office for seven officers (so far)