Unless thay weren't actually 'bad' people, rather they found themselves having to use a gun as the only option left to them. One notable bit of info missing is why these people had a gun and why were they using it?
This chart is taking into account situations where a person shot or attempted to shoot multiple unrelated people in a public setting. The stereotypical mass shooting. I really don't care what someone is going through, my sympathy for the poor and disenfranchised does not extend to indiscriminate murder