The possession of self-loading firearms cannot be something the Framers envisioned as one of our natural rights, because they were not invented before 1776.
Legal and safe abortions cannot be something the Framers envisioned as one of our natural rights, because it was not invented in 1776.
Blacks voting and going to school cannot be something the Framers envisioned as one of our natural rights, because it was not invented in 1776.
I could go on. Point being, the constitution is a living document, it gets extrapolated to present day life, and "Framers" don't get the last say.