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Well, consider that many states have restrictions on the infringement (read “regulate”) or abridgement.
As an example:

New Mexico Constitution, Art II, Sec. 6. [Right to bear arms.]
No law shall abridge the right of the citizen to keep and bear arms for security and defense, for lawful hunting and recreational use and for other lawful purposes, but nothing herein shall be held to permit the carrying of concealed weapons. No municipality or county shall regulate, in any way, an incident of the right to keep and bear arms.

Yet the courts have ‘rules’ prohibiting firearms in their buildings which they warn will prosecute violators... my question: under what law would they be prosecuted considering “NO LAW SHALL ABRIDGE THE RIGHT OF THE CITIZEN TO KEEP AND BEAR ARMS FOR SECURITY AND DEFENSE”?

North Dakota Constitution, Art 1, Section 1.
All individuals are by nature equally free and independent and have certain inalienable rights, among which are those of enjoying and defending life and liberty; acquiring, possessing and protecting property and reputation; pursuing and obtaining safety and happiness; and to keep and bear arms for the defense of their person, family, property, and the state, and for lawful hunting, recreational, and other lawful purposes, which shall not be infringed.

and
Section 20. To guard against transgressions of the high powers which we have delegated, we declare that everything in this article is excepted out of the general powers of government and shall forever remain inviolate.

And yet ND has concealed carry laws/licensing.

South Dakota Constitution, Article 6, § 24. Right to bear arms.
The right of the citizens to bear arms in defense of themselves and the state shall not be denied.

And yet firearms are denied (read ‘illegal’ to bear) in courthouses, city buildings, and state buildings.

So, it takes little effort at all (especially in this area) to show that the government is acting illegally, and least we forget most of the States have something like this in their Constitution:
“All political power is vested in and derived from the people: all government of right originates with the people, is founded upon their will and is instituted solely for their good.”
Which is a direct reference to the Declaration of Independence:
“But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.”