Too many bad ones. And too many “good” cops who close ranks around them.
There isn’t that many bad ones.
As far as the rest if your comment, they “close ranks” because A.) They don’t want to be viewed as “sniches”. B.) They want to be sure that backup actually arrives if and when they call for it.
C.) They may not know of or have witnessed any wrong doing.
But hey you are obviously of the persuasion that all cops are guilty of everything under the sun no matter what... Innocence be damned.