So only use it if your r sum is going direct to the hiring manager or if it is a smaller company. And finally, the main reason that all the books say this is wrong is because of the potential for discrimination. They are right, but only to a very limited degree. Bottom line is that there are still some rednecks out there who will discriminate against you for your race, your sex, your religion, and any of a variety of protected classes. You probably would not want to work for them anyway.
Discrimination does happen.
So if you are worried about potential discrimination, you have to go into this one with your eyes open. But remember that for every redneck, there are scores of professionals who will value your diversity. It is a risk, yet it is up to you to take that risk in a calculated way. If you feel it has the potential to enhance your job search, use it. If not, don't.