If there's a fixed supply of "criminals", sure, but there's not. People change. In the right circumstances people who might otherwise be law-abiding commit crimes, and vice versa.

What do you call someone who doesn't commit crimes any more?

I submit that "criminal" is the wrong word, certainly when your focus is public order in the present day.

Killing less or not killing at all (anymore) doesn't automatically make someone non-criminal - there are lots of other types of crimes.

What is important, the number of criminals, or the number and nature of crimes ?

I think the goal is to reduce the later, attacking the former was just a way to try to do that.

Ecuador strat seems to work toward the second goal, just without tackling the first.

Let's see if how this goes.

If additions to the biggest music genre, and a massive art genre, is the negative results of doing this then they should be doing a lot more of it.

You could say the same thing about Frank Sinatra