Lots of people do. Abuse is an equal opportunity problem. Nobody is demographically immune from abusing or being abused. Anybody can abuse someone they care about, and many, many do. Wealthy people do.
Poor people do.
White folks do. Folks of color do. Able-bodied folks do. Differently abled folks do. Libertarians, Reform Party folks, Socialist Workers, Green Party folks, and even Pat Paulson supporters do too.