They can barely catch and convict people who shoot a person with several witnesses. The talented detectives leave at 20 or sooner instead of sticking around to train and lead. The people leading are administrative types who left the beat a lot time ago without being a detective or else they went to a do-little unit run by do-little bosses who couldn't arrest their way out of a problem if they tried. The other thing is nobody takes threats seriously. Not even the FBI. Look how they let that maniac