Below are thoughtful articles on the dangers of privatizing marriage:
Jennifer Roback Morse:
Other Writers: Why privatizing marriage would be a disaster
Science shows the stabilizing factor of traditional two-parent, binary-sex family: Supreme Court needs to read latest science on marriage: Gender and Parenthood
The importance of marriage and like topics: National Marriage Project (not a Christian organization)
Summary video: Why Marriage Matters (note the reference to “complex families” which leads to instability in childhood).