This is one source for the claim.
I know Sweden is having increased delinquence but if this claim is true then the real delinquence is way beyond to what it shows on some statisticss.
I edit to make the question more clear, in the news it states:
The criminal situation in Sweden may be heading for an even worse turn as a new report has shown that the vast majority of the Swedish police force is so unhappy they are looking into other careers.
With this I think it's clear it refers not to something like "I've had a bad day, I want to quit", but to much more strong consideration of wanting to quit.
Can someone confirm this claim?