The problem with having to list 3-6 positions is that in some cases the oldest position could be from a really long time ago. I only had two very long-term jobs and the first of the little temporary or unsuccessful gigs I had before that was 30 years ago. The solution is to list them anyway, as a potential employer too will think that they are not very important any more. However, I don't like the notion of losing a job for omitting one or for having forgotten the exact dates.
We will never get rid of criminality, but we could redefine some and make some obsolete. For instance, we could legalize things like drugs and the obscene material that is currently illegal (except for those who are producing new material by using real humans or animals), lower the legal drinking age (or eliminate in reality the penalties for drinking under that age) and stop putting in prison people who are having a consensual relationship with an older minor (16-17).
Other crimes can be eliminated by making them impossible or unprofitable or otherwise less likely. It has been argued that home burglaries have been reduced because selling stolen electronics is less profitable. There are devices for tracking stolen cars. What cars are there to steal anyway when paid transportation services are more practical than car ownership? Should pawn shops even exist? If they exist, an overabundance of goods would make theft less profitable after a while. A housing and rental market that allows more people to afford larger homes or even a secondary home would reduce domestic violence (not that it is acceptable when there is overcrowding, but perhaps it would happen less). It's by working on factors that promote crime or make it easier or even possible that crime can be reduced.