That is a great thought...
The hard part is ... that good deeds tend to have a gentle slow spreading effect that takes time....like a wave ..or better...a cloud.....or a hit from a pillow full of air...
whereas horrible deeds tend to have an impact like a sledgehammer or bullet...usually with an immediate impact and effect...

Top the bullets ...
hand everyone bazookas ...
then everyone will pine for the good old days when bullets flew everywhere...

wish I could laugh at that last one...
but ...I just can't.

best suggestion is....
use algorithmic programs to hunt down every violent person ...
and humanely put them down.