The police take on a very unique, often admired, often reviled job. They are expected to use force, but only 'this' amount of force. What 'this' amount of force is varies from situation to situation, and from viewer to viewer. They tread a very fine line, and, being human and working with humans, they run the risk of crossing it or having people percieve that they have crossed it. Everything from people starting to pay attention, to video cameras being switched on, often only happens once instigating factors have already occurred and a response is taking place, skewing eye witness reports. Knowing that they put themselves in this kind of risk, part of the saving grace for officers is knowing that they won't lose their livelihood while it all gets sorted out. Take that away and you leave a large portion of good cops who will simply not take on the increased risk. Why should they? Innocent until proven guilty is the right of every other citizen in this country, why should officers have to give it up for the 'honour' of taking on the risk of keeping the law?