To me this just reinforces why responisble, law abiding citizens should not be denied the right to own, possess, and carry firearms for self-defense. That being said, if you do own one, don't rely on passing the qualification on the CCW or CCL courses. Compared to LEO courses they are pretty under par, and it is important to practice safety and marksmanship with your firearm. It is also important to understand and be able to effectively and quickly use the holstering system you choose that works for you.

If you own just one firearm, understand it intimately. What are it's capabilities? What type of ammunition are you using, FMJ's (Full metal jacekts) tend to have overpenetration issues in urban settings than JHP's (jacketed hollow points) for instance. Know how to load and unload it safely. Know how to disassemble and clean it for reliability.

The Second Amendment is a right for all citizens. Proper use of that firearm is a responsibility.