Um, there are many gun control ideas. Many gun control advocates own guns and want to keep them. I own guns and want stricter laws. It's extremely easy to get a gun in Texas, but there still is a gun violence problem in the predominantly black neighborhood on the east side of San Antonio. If San Antonio had as many black people as Chicago, the murder rate would probably be almost as high.
Oh, and if I'm not mistaken, I don't think it's that difficult to get a gun in Louisiana, and New Orleans still has a pretty high murder rate.
By the way, as much as Chicago is brought up, it's not even close to having the highest murder rate. I guess talking about murders in a place like Memphis, TN just doesn't help people's political agendas.