Earlier quoted context omitted.
I can't imagine anyone arguing against Miranda rights, the right to appointed council when you can't afford one, etc. Can you think of a single good reason these shouldn't exist? Whichever rather liberal supreme court that was let's get them back ASAP!
I think they make sense, but they're definitely not explicitly or even implicitly granted in the U.S. constitution, and the various legal theories (e.g. substantive due process) behind the court's power to recognize them are still vilified by conservative jurists and pundits. Miranda Rights had historical precedence in England, but IIRC mostly after America forked. The right to counsel mentioned in the U.S. Bill of R…
To the point you mentioned, from the Sixth Amendement: "In all criminal prosecutions, the accused shall enjoy the right ... to have the Assistance of Counsel for his defence." You can argue over how that counsel should be appointed, but I would categorically disagree with the interpretation that it only refers to you hiring your own attorney.
[0] "nor shall be compelled in any criminal case to be a witness against himself"