The Founders had an interesting idea around that “bully” or “external attack” problem...
“A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.”
Allow everyone who wants to be armed to do so. Deters the common thief, the tyrant warlord, and local despots. Some 340 million people in the US. About 100 million ARMED.
Makes for a good deterrent to aggression as even a nuke can’t get us all.
How do you have a “well-regulated Militia” in an anarchic society?
Anarchy means there are no enforceable rules or regulations.