Per the website there were 499 CCW murders over 5.7 years.
That is about 90 deaths a year.
With a population of 300 million, your yearly chances of being killed by a CCW holder: 0.0000003
You might want to check the details. The website talks about "killers" not "murders". The number of dead include suicides and cases that are still pending in court.
Making good people helpless won't make bad people harmless.