Whats the ratio of innocent people killed by guns/people (criminals)killed in legitimate self defence with guns?

I'm trying to work out if I like guns but I need more data before I make up my mind. If like 50 criminals are killed by guns for every innocent person killed, then pretty much I think guns are cool.

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Rain95 · 26-30, M

I don't know the ratio, but people still get charged in my country for self-defense.

There was one woman and man who plotted to kill the stepfather who raped her for 12 years. She stabbed him in the heart and both got premediated murder.
1. Kim Bo-eun: 3 years in prison. (Note: She received probation.)

2. Kim Jin-gwan: 5 years in prison. (Note: He actually ended up serving about half of the sentence.)
In the Court’s view, the infringement was indeed “impending,” but the method used (i.e., stabbing to death) was seen as excessive. It, therefore, lacked “reasonable grounds.” The Court felt there were less extreme methods available (for the defendants) to extricate themselves from the situation. Bottom line: Was it necessary to kill the stepfather in such a manner?