What does make a difference is an armed response.
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Surprise, surprise. Gun control doesn’t work.
The following is from the NRA-ILA,
Back in March, we reported on Colorado Governor John Hickenlooper (D) signing into law the most sweeping anti-gun legislation in the history of the Centennial State, despite overwhelming opposition to the legislation. The new law, among other things, bans magazines with a capacity of greater than 15 rounds, imposes a “gun tax” for a background check when purchasing a firearm, and criminalizes the private transfer of a firearm. The anti-gunners claimed these measures would keep guns out of the hands of bad guys.