Quite a number actually. In domestic violence situations the abused could fight back and still end up in prison. A weapon should be the last resort not the first. There are cases in which police shoot the wrong person when acting hastily or just plain abuse their position and kill someone for their own agenda. There are corrupt cops, politicians, and many many others in every walk of life.

The 2nd Amendment is important but it should not be the main focus of dialog. Education about how to get along with people and civics should be a lot more important and maybe more instruction about the Golden Rule. I do not necessarily mean Christianity as many religions share the idea of doing onto others as you would have done undo you.