Back in the 1930s gangsters with Tommy Guns far outgunned police forces. Cops responded with heavier weaponry. Now they have to deal with ARs and MAC 10s.
Unfortunately you have swallowed the leftist propaganda hook line and sinker. Cops are not dealing with ARs and such on any statistically significant level. In fact the percentage of crimes committed with ARs and MAC-10s is so low it’s difficult to measure accurately. Most cops will spend there entire career and never see any rifle used in a crime much less an AR-15. What you stated simply isn’t true.