As Justice Kennedy explained in Lawrence:
“Had those who drew and ratified the Due Process Clauses of the Fifth Amendment or the Fourteenth Amendment known the components of liberty in its manifold possibilities, they might have been more specific. They did not presume to have this insight. They knew times can blind us to certain truths and later generations can see that laws once thought necessary and proper in fact serve only to oppress. As the Constitution endures, persons in every generation can invoke its principles in their own search for greater freedom.”
Kennedy thus acknowledges the Framers' understanding of the nature of citizens' rights as expressed in the Ninth Amendment, and the Founding Generation's wisdom and humility as to not presume to know our protected liberties as some 'finite manifestation,' but rather the codification of fundamental principles of freedom designed to safeguard those protected liberties from government excess and overreach, and give citizens license to defend those liberties.
While I appreciate Kennedy's very clear description of how he sees things (and that is, of course, very important, given his position on the SCOTUS), nothing is every really settled.
Hence the reverse of what he says is also true. Laws that didn't exist at one time may be needed depending on the "truths" of the day.
Those liberties also include the liberty to protect ourselves from that which we feel is dangerous.
What is unfortunate is that the court has gotten into the business of trying to decide that on their own.
Again, the Court is not 'deciding anything on its own.'
The people decide, the people petition the courts for a redress of grievances, the people seek relief from government excess and overreach in the courts, invoking the principles of freedom and justice enshrined in the Constitution and its case law intended by the Framers to safeguard citizens' protected liberties.
The people created the Constitution, the Bill of Rights, and the Ninth Amendment, the Supreme Court is following the will of the people as expressed in the Founding Document.