Newspapers don't make money from headlines like "Man is robbed and goes home shortly after" They make money from reports of insanity. These people are unfortunate in that they were chosen by mentally unstable people to kill, but the chances of it happening are small compared to examples where people were robbed by a desperate, but otherwise regular person.
The murderers in your examples are obviously very disturbed individuals, and one was noted to have been high on PCP prior to the murder. In those cases, a single-shot 9mm bullet would not have convinced them not to kill you. The palm guns are marketed towards seniors, I presume, and I doubt their abilities in gun handling. The guns will do more harm than good, maybe convincing a 70 year-old man that he is safe when walking in a dangerous neighborhood.
Murder isn't something one does willy-nilly, and even killing in self-defense would be hard to for a regular person. Soldiers are drilled specifically to prevent them from hesitating in action. What people say they can do and what they would do in a high-stress scenario is uncertain. Having a gun does not automatically make you safe, and may cause you to take higher risks than you would have without one.
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The entire German garrison of Vanviken, right here in your thread! 
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