Some of these kids saw the destruction caused by divorce and fear that more than they desire to be married.
More likely , the millenials are enveloped in narcissism, as were their parents.
I, for one, would be most grateful if they stay in the basement and do NOT procreate.
That may be a factor, too. Not only is there the economic destruction in divorce, but the emotional impact as well. If they have suffered that, they may have little faith in stable relationships. Even growing up in a home where the parents remained together is no guarantee when surrounded by a peer group who suffers the effects.
The "some" of those kids are the male kids.
Everything about the law and modern culture puts the blame on men first when something goes wrong.