No - you have it backward.  Crime surged when oil [or the military, or anything else] booms and the hucksters, con artists, vice lords and pimps swarm in with all the people looking for high paying jobs.  Many of them leave with fading chances for 'striking it rich' fast.  IF we can clean State gov't up enough to stop feeding the local crooks with special projects and treasury funds, they might leave too - the more the merrier.