When Jefferson was alive the consensus was that black people did not have enough intelligence to coexist with white people unless they were segregated. Equality of rights at the time only applied to white people (and even then to British whites) and only was only extended to blacks in practice due to the assumption that they have the same intelligence as whites. While I think that all people should have equal rights, in practice only people with high enough intelligence will be born, let alone have equal rights, once embryo selection and genetic engineering are the norm, unless we find some sort of black magic that can boost intelligence of adult humans to the same IQ GMO people have.