Hypothesis : One of the key reasons for seasteading is to get to an interference free space where all kind of developments can take place.
United Nations "universal rights" | 12
No one shall be subjected to arbitrary interference ... Everyone has the right to the protection of the law against such interference...
As in the micro cosmos of this thread where it seems to be just impossible to get a "nutcase free space in the backyard of the thread i opened" our planet is crowded by "tortious interferers" of all kind, who turn any new project, any scientific progress, any development intent, into a "interference hell".
Seasteading offers a way out of this dilemma.
The need to Break away from the tortious interferers who hinder your art and disturb your tranquility may well be the key driver for an oceanic Breakaway Civilization.
Good fences make good Neighbors....is a saying - what could be more comforting than a good stretch of ocean between you and the "next hostile interferer".