I used to work with this guy who was so straight laced by the book that it was ridiculous. He thought games were a waste of time, and that I was too old to play games. But even he said: "If I am going to play a game, at least I want to kill something."
So yes it is an escape from the boredom and frustation of daily life. The only time I object to violence is when it is used to cover up a bad story or poorly designed game. For instance, I thought that Dragon Age II, especially with persistent gore enabled, was over the top with exploding blood (and overdone art design), at least partially to make up for lazy design of the rest of the game. It didnt bother me in the first dragon age, because it had a much better story, and the blood seemed secondary to the story, not almost the point of the game to see how much exploding blood you could see.