The number one indicator for crime, almost tautologically, is having previously committed a crime[1]. Keeping violent criminals in jail prevents future crimes, it is fundamentally not the same as just putting a band-aid on a cut. "Avoiding to create criminals" is less important than preventing crimes, as the same small group of offenders is often at fault for the same crime [2].

[1] https://www.news.iastate.edu/news/2018/12/18/crimehistory [2] https://www.silive.com/news/2023/04/nyc-shoplifting-report-s...

Also avoiding to import criminals, see Sweden - where I live - for a good example of where that can lead [1]. For the naysayers and label-throwers I can only point at the statistics in the knowledge that these are immune to accusations of racism (et al).

There's also a UN report which lifts up Sweden as an exception to the rule that violent crime is on the wane [2, page 119]: Sweden has experienced unprecedented levels of gang violence and firearm-related deaths in recent years ... Sweden had one of the highest levels of firearm-related deaths in a study over 20 European countries

[1] https://sv.wikipedia.org/wiki/Kriminalstatistik_i_Sverige#/m...

[2] https://www.unodc.org/documents/data-and-analysis/gsh/2023/G...

how do you propose to do that?