There is quite a debate into the “what ifs” if your view of the Constitution had triumphed throughout history. Maybe we would have ended up with a Constitution like Alabama’s, with its 770 Amendments to cover most any issue that arises, without the need of judicial interpretation. Maybe right thinking people would have realized slavery, segregation, and oppression of minorities are not good things, and they would have been added without the need for a Civil War, massive racial unrest, and lychings. Maybe people would have recognized the impropriety of criminalizing sexual relations between adults. However, given the history of this nation, I sincerely doubt it. Passing an Amendment is, of course, the preferred method to enshrine rights, but it is not the only way. The legislature, the executive, and the judiciary all have a role to play. Why would the definition of rights be the sole province of the legislative branch? The Constitution doesn’t say that, and it flies in the face of their concerns over separation of powers. But when you have a majority of people who insist on denying those rights to others, your view won’t work. History, human nature, and reality keep getting in the way. Our country has suffered greatly because we couldn’t live up to the ideals of the Constitution. Hell, even the founding fathers couldn’t.
Many of the founding fathers realized this. They set up a judiciary that was not subject to the political process (in the normal sense of the word), to protect the Constitution and the rights of people. Many founders were very concerned that your view of the Constitution would prevail and that the enumeration of certain rights would deprecate unenumerated rights. So they put it in the Constitution, in the Ninth Amendment.
Wherever does a textualist get this idea? Is it in the language? Is there some part of the Constitution I’m missing? Maybe you could get a Constitutional Amendment to say so.
If you accept the judiciary’s role is one to protect and interpret the Constitution, that must include the power to determine rights, and to balance those rights against governmental powers. That’s what the judiciary is there for.
I would most certainly prefer legislative solutions. I would prefer that a majority of people wouldn’t want to legislate our bedrooms (well, actually THEIR bedrooms), our choices in contraception, who we marry, who can eat at a lunch table, and where someone can ride on the bus. But they do. And the founders realized that these, and a multitude of others, acts of the majority need to be protected against. And they gave that power, in part, to the judiciary.