A lot of couples fall into the hole of vices because of this, if not substance abuse then infidelity.

The amount of stories of "we were working all day and didn't have time for each other..." that led to one or both committing adultery is quite alarming. But it's all part of the Left's plan to incrementally destroy the fabric of a sound household, and with it, the moral principles and foundations two well-adjusted adults could instill into children.