The world had moved forward at a lightning pace, bringing with it a huge amount of advancements, both medical and cultural.
With this great advancements something had to be sacrificed, and that was the criminals. There was a three strike rule, and then you were out, you were taking in front of a firing squad and humanely killed.
There was only one thing that could be undone to make this right again, to stop children being murdered for stealing a loaf of bread, but it would mean having to put the world back to the beginning again. Stop people living forever and the space problem would disappear.
But was it worth it?