You know them: Friends who are really enemies -- "frenemies." High school gangs. Street thugs. Unfaithful spouses. Unethical co-workers. Substance-abusing relatives who lie to you. Put-down artists. Adversaries who try to undermine and destroy you. Sleazy salespeople and unscrupulous loan officers. Anyone who lies, cheats and steals, showing no regard for the welfare of others.
In short, the people who make you want to scream. All of us have them in our lives, every one of us. But yelling at such people face to face is not always an appropriate or productive thing to do.
That's why Psalm 5 encourages us to make an outcry first to God.