1. Victim/oppressors
This is the mindset that grows hatred and we've all seen where hatred leads. And I know what you're thinking 'But Rocco you don't understand they caused it. Justice must be served!'. They might have put the final staw onto the camel's back, but what about all the other straws? We seem to be blind to them and as a result prevention is rarely made, implemented at the last step.
For example school shooters. If we ban guns they won't be able to shoot/if we had more guns they won't be able to shoot. This is tackling the last straw, what about tackling what lead the shooter to that point? Their mental health. More specifically the victim/oppressors mindset (they always believe they're the real victim). Tackle that and you reduce a lot more shootings as well as other crimes that come as a result of hatred.
Back to your initial response. Justice does need to be served when an injustice is done. It should be proportional to the actions, no more and no less. That's why we have courts.
Stop seeing yourself as a victim. Life's not fair it's on you to play with the card's you've been dealt not whine that others appear to have better card's.