The House of Games: Irony

I don't really know what David Mamet's real intention about making this movie is, yet he showed a lot of ironic scenes that seemed to send a message.

One of the ironies that I noticed in the movie was the gun, that Margaret used to shoot Mike. Near the beginning of the movie, Margaret takes the gun away from Billy, a patient who came to a therapy session for Margaret's help, because he was trying to shoot himself to get away from his life. Margaret, hence, took the gun away to help a person. In the end, in desperate need for help after being betrayed by Mike, she takes that gun to shoot him.
The other one is the title of the book that she wrote. The title of the book was The Driven: Compulsion and Obsession in Everyday Life. Where did she drive herself towards? Her obsession with Mike and his scam, led her to lose herself. The compulsive side, then led her to commit a crime.

This seem to send a message, that things are understood or misunderstood depending on the content and the atmosphere of the situation. The word driver, of course was comprehended in a manipulated and set up setting. Also, the connotation of taking away the gun, ended up being the beginning of a changing character.