That the states were guilty of racial discrimination is a reason to not let any government be too powerful. It is the genius of our Constitution that gives our federal government the authority to enforce it when necessary. The "conservatives' who wrote, passed, and enforced segregation laws did so in violation of our Constitution. Segregation cannot exist without government approval and support.
"If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary. In framing a government which is to be administered by men over men, the great difficulty lies in this: you must first enable the government to control the governed; and in the next place, oblige it to control itself." James Madison
The state governments did not control themselves. The idea that they could or would is why we have elections. However, when one political party, Democrats, controls state governments for decades the denial of a person's natural rights can and did happen.
The state can never straighten the crooked timber of humanity.
I'm a conservative because I question authority.
Conservative Revolutionary