What data are you using to inform your opinion?
How many cops are actually held liable by a court of law, for say 2016 or 2015 (as the public release of these sorts of data usually trail “current” by a year or more).
For example, using this Baltimore case, the number of cops subjected to paying judgement/settlement sums is exactly two (2) over the past 3 years. In that jurisdiction, which has >16k sworn officers making it the 8th largest force in the US.
BTW - 2 cops out of ~16k = 0.01%