In my scifi stories the way crime is kept low is what is called the ‘rank system.

You can read in detail about it here: https://vayneline.com/concepts-terms/rank-system/

Essentially, when anyone commits a crime they are assigned a bounty and a point value based on the severity.  Criminals can turn on each other to gain the bounty but to also reduce their own crime.  Thus there is a ‘traitor’ element to crime now so that people can redeem themselves by turning enough other criminals in.