Marriage is fundamental to society. Throughout history it has been the most fundamental way in which we recognize something beyond self interest, namely the common good, cooperative relationships, shared identity and collective responsibility. Marriage is foundational of a free society, almost all of disturbances of society arise from the irregularities of domestic life. Rabbi Lord Jonathan Sacks – Morality p65
Since that is correct, the abandonment of marriage, which is certainly the modern trend, will increase the prevalence of self interest and therefore damage society.