I fall into the originalist camp.
Constitutional originalism is the principle or belief that the Constitution should be interpreted in a way consistent with how it would have been understood or was intended to be understood at the time it was written.
Constitutional modernism is an approach to constitutional interpretation that considers the Constitution as if it were ratified today. Modernists believe the Constitution is a living document that evolves with society.
Unlike Alan Dershowitz, from what I've read the framers carefully crafted the Constitution and its amendments, fully aware of the scope of what they debated and ultimately voted on. I don't think they forget include words. I don't think they meant, "just this last insurrection" otherwise they would have spelled it out.
When conservatives love Alan Dershowitz
"A fair reading of the text and history of the 14th Amendment makes it relatively clear, however, that the disability provision was intended to apply to those who served the Confederacy during the Civil War. It wasn’t intended as a general provision empowering one party to disqualify the leading candidate of the other party in any future elections." --Alan Dershowitz, No, the 14th Amendment Can’t Disqualify Trump
When it comes to the Second Amendment, unlike Dershowitz, I don't think the framers intended any unwritten limits on gun ownership. While they probably didn't visualize modern lightweight semi-automatic rifles, unless and until there is new amendment ratified that limits the types of guns that are legal, we are stuck with the 2nd. I've written about this before: we can limit gun tragedies substantially without infringing on the right to bear arms.
When conservatives hate Alan Dershowitz
“We have to fulfill what the real meaning of the Second Amendment is: reasonable access to guns for self-protection and for hunting. And there’s no room in America for these semiautomatic, automatic and other kinds of weapons that are simply designed to cause mass havoc." --Alan Dershowitz
Dershowitz called the Second Amendment an “anachronism” because if America had the choice today it would not choose to be an “armed society.”
“The Second Amendment has no place in modern society,” he said.