Yes, some defense lawyers work pro bono and that is because they need the practice, and some defense lawyers want to help out someone they think needs their help. Although most defense lawyers want a fee for their services, there are a few that do not. Plus, there are those court appointed lawyers that are chosen by the courts if you can not afford a lawyer.
One will find that criminal defense lawyers to be part of the government as the field they work in can be classified as 'Legal', they deal with the crimes, victims, and criminals guilty of crimes. Criminal defense lawyers work very closely with the government, since the government is responsible for the crimes of the country.
There are several experienced criminal defense lawyers that operate in Orange County, California including Virginia L. Landry, Anita Kay, Courtney Pilchman, Randy S. Collins, and Ronald D. MacGregor. A full list of criminal defense lawyers practicing in Orange County can be found online at Lawyers Find Law.