[gwright]

I've wondered at times if it would make sense for there to be an explicit legal proceeding at the age of majority in which you explicitly opt in to the social contract analogous to the naturalization process when a foreigner becomes a citizen.

I get hung up on what happens if you choose not to opt-in.

[landemva]

You would still be subject to not harming others nor break a voluntary agreement/contract. People have rights, and may defend themselves.