Having read some of the commentary in these forums on security/defensive systems/weapons, I would bet a barrel of barnacles that The Seasteading Institute will be clever enough to establish law enforcement & security policies, tactics, techniques and procedures that steer well clear of any conch-headed ideas about turning seasteads into something akin to the atoll in “Waterworld”.
The waters of French Polynesia are hardly infested with pirates. Intel assessments indicate this is not going to change any time soon and render these environs as dangerous as the Horn of Africa, Nigeria, SE Asia, etc.
Besides the usual crime commonplace with societies, such as theft, assault, fraud, and so on, the three primary types of crime a seastead will be faced with that might have the potential for mass casualties and catastrophic loss are cyber attacks targeting functional systems, insider-threat attacks (kinetic and cyber), and terror attacks. The good news is that these three types of crime can be defended against without images of the Deacon at the helm of his war barge coming into play.
Seasoned maritime counterterrorism professionals certified in human behavior pattern recognition & analysis, who also have real-world insider-threat detection & prevention credentials, will be instrumental in any comprehensive security plan, the latter of which, we must not forget, will be joined at the hip with the legal system in place and the governance philosophy.