We have no plans to make membership of a gang, in and of itself, an offence. The Sentencing Guidelines Council has already declared that, where an offender operates in a group or gang, this should be regarded as an aggravating factor, indicative of a higher than usual level of culpability, to be taken into account in sentencing (Guideline on Overarching Principles: Seriousness, 16 December 2004).
Research has not been commissioned specifically looking at the link between crime and unhappiness.
However, the British Crime Survey (BCS) asks about the impact of crime and fear of crime on quality of life. The latest analysis, from the 2006-07 BCS, shows victims of crime were more likely to report that crime and fear of crime had a high or moderate impact on their quality of life than those who had not been victims. This analysis can be found in the Home Office Statistical Bulletin Crime in England and Wales 2006-07, a copy of which can be found in the House of Commons Library.