It is an inherent function of the US legal system that ANY precedential decision by the US Supreme Court becomes law. This is a principle that we inherited from the English through our colonial roots. The principle of judicial review was established in 1803 in a case called Marbury v. Madison, a decision that was based in large part on English legal precedent and Federalist No. 78, authored by Alexander Hamilton. Again, this is basic civics 101.
"And then while you're at it, re: abortion: just show us what people supposedly made what law. And if they think they did make law, supply us with the Constitutional rationale for their having done so."
The people elect the President, the President nominates justices to the Supreme Court, and the Senate - elected by the people - approve those appointment through the process of advice and consent, ergo Supreme Court decisions are a representation of the will of the people.
This is America. We don't enact law through popular vote, but through a process of representative government which is an expression of the people's will. That same expression is seen not only in our Executive and Legislative branches, but our Judicial branch as well.
Again, If you can't understand that very elementary principle of governance, I recommend adult education classes - knowledge is power, empower yourself.
You wrote:
We are a representative republic, with laws written by for and of the people.
I'm only quoting you. Still don't understand the process do you?
I asked you to name the people who wrote the law legalizing abortion and name the USSC which was ever Constitutionally authorized to write the law. You can't.
Clue to you: USSC is vested with interpretation of law only, it does not write law, and if it attempts to, it does so without any authoity to do so in the US Constitution.
Ultimately though the rancor being shown here by both sides is just a microcosm of the massive divisiveness inflicted on this country by the truly evil Roe v Wade decision.