You may want to look at your empathy problem. You should not feel bad for someone you consider evil as you implied.
If killing vulnerable people is bad, he's evil and his death doesn't matter. That's how normal human empathy works.
Yours? Abnormal.
Biology dictates some have lower thresholds for suicide than others.
These people are dangerous, they often externalize.
That's extremely rare. Most people mentally internalize.
Biology dictated both his life and death.
