Here's a comparison for you with some official statistics from England and Wales: https://www.gov.uk/government/statistics/police-use-of-firearms-statistics-england-and-wales-financial-year-ending-31-march-2014-data-tables
Specifically look at table 4. The number of times the police actually fired a bullet per per year in England in Wales is in single figures. Now, someone's going to come here and say the populations are different. The combined population of England and Wales is 54M, the population of the USA is 319M. That's only 5.9 times more people in the USA than in England and Wales.
So therefore, the 2 times the police in England and Wales shot a bullet between April 2013 and March 2014 scales up to 11.8. Do you honestly think American police fire less than 11.8 bullets per year?