Without criminals, there would be no need for:

Police

Detectives

Foresnsic sectionand investigative staff

Prison Officers

Sociologists

Many counsellors

Lawyers

Magistrates

Judges

Court Officers

Security staff at every shopping centre and in stores

Many Ambulance staff who are. Often called upon to support victims of crime

Staff monitoring the wearing of ankle brcelets and those onbail for crimes

Juveniles and youth following in the behaviour of their criminal elders

Liason Officer and the huge cohort of Family Services staff dealing with domestic violence issues.

Police dog handlers and trainers

The list goes on

And on

And ….