I think nobody is consistently only good or only bad, but we can say all shooters stopping an attacker is good in the moment they stopped the attack, even the attacker deciding to off themselves.

You should likely count the suicide number as well the attacker shot the attacker :-)

I've had this same problem and developed some nerve damage/chronic pain. Took a few months of sleeping with better posture (yes its really hard to change at first), and it recovered.

I did see a doctor that confirmed the issue, did an x-ray and recommended posture change.