Does liberalism contribute to the social problems of crime and family breakdown? Well yes it does. Sean wants me to back up my claim, so here goes. Sean et al, please consider the following as the beginning of a discussion rather than an outright claim of proof.
Let us start with family breakdowns. Generally speaking, liberals want to help people who are having difficulties, albeit with other people's money. Such a view leads to policy choices. One of the most pernicious and harmful to families is what most call "welfare." One of the consequences of welfare was that men became expendable as the government became the provider for single women and their children. Perverse incentives resulted wherein there were financial incentives to have children and remain unmarried. The result, predictably, was more single parents, more men with fewer responsibilities, more fatherless children.
Now crime. Again liberals have a soft spot for the downtrodden and this leads to policy choices. With respect to crime, liberals tend to hold society to blame for the bad behavior committed by criminals, well, unless they are white collar criminals. This mindset leads to excuse making/blaming of others rather than holding people accountable for their own behavior. This is particularly harmful for children to be fed the ideology that they live in a society bent on oppressing them. Thus bad behavior will not be "nipped in the bud" but rather will be seen and perhaps inadvertently encouraged as a sort of protest against society. As far as policy goes, this mindset contributes to laws that allow criminals to walk because of technicalities, light sentences, comfy prisons etc... that make criminal activity a more attractive option.
In both cases, liberalism fosters irresponsibility. When indeed we get irresponsibility, why should we be surprised?