Americas police clear about half of murders and nonnegligent man

Avalon - Americas police clear about half of murders and nonnegligent manslaughters in the United States, which is a 52.3% clearance rate. Aggravated assault: 41.4%, Rape: 26.1%, Robbery: 23.2%
The U.S. spends nearly $222 billion on law enforcement, Retired police officers' pensions vary from the mid 80,000 a year to mid 50's. I sure most all law enforcement officers work hard and long to be able to retire. But are we getting our monies worth?