You believe that no other factor explains the difference better? The reason is "incompetent police"? Why did the US not have the same problem in the past? You would explain it as somehow, across the entire country, all police, at all levels, just become incompetent sometime in the last generation? Why don't you list some of the other countries that you believe have things figured out, and we can see what they have in common, other than "competent police"?