A sin isn't just one isolated act with no further consequences. Sin is always far-reaching, poisonous, and ultimately fatal. The Fifth commandment tells us to honor our parents. Parents lose their trust in their children. Lies and deceitfulness abound.
Tempers flare and arguments increase.
Peace and safety are forgotten as resentments and bitterness gain footholds in the home. The first sins rippled out into the second and third and fourth waves until the problem in the family is so big, it takes outside help and years of healing to bring the parents and their children back together. The Sixth commandment tells us not to commit murder. Jesus added to this by telling us not to hate either. Think also of the ruined reputations, wasted lives, broken families, hatred, violence, loneliness, and despair that result.