It’s way more than just trigger discipline. There’s the traditional rules of course:

• Never point your gun at something you do not intend to kill
• Be sure of your target and what’s beyond
• Trigger discipline

But there’s also reasonable shit beyond the 5 basic rules:

• Don’t willingly put yourself in a situation where use of a gun may be warranted.
• Property isn’t worth killing over, especially in situations where you had to go out of your way to put yourself in perceived danger to protect it.
• Don’t block in the person you are trying to convince to leave.
• People with guns commit more acts of violence than those who don’t. Owning a gun is an irresponsible choice. There are more and there are less responsible gun owners, but owning a gun puts you and those around at a greater risk of violence. When all you have is a hammer …