Gun owner here.

1. Treat all guns as if they are always loaded - Followed
2. Never let the muzzle point at anything that you are not willing to destroy - Violated
3. Keep your finger off the trigger until your sights are on target and you have made the decision to shoot - Violated
4. Be sure of your target and what is behind it - Violated

This shooter violated three of the four fundamental gun safety rules. That’s not an accident. It’s attempted murder.