Right. The reason is the Constitution haters that want to twist the 14th Amendment to unduly expand federal powers. Your side.
“The only conclusion possible from this history is that the drafters did not intend to have the Fourteenth Amendment withdraw from the States the power to legislate with respect to this matter.” —William Rehnquist, Roe v. Wade: Dissent
Just exactly which part of “No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws” do you fail to comprehend?