Agreement is not the only prerequisite for a legally enforceable contract. The contract also needs to avoid certain unenforceable things like unconscionable clauses, or agreements to do things that are illegal.
Because the purpose of a judge is to interpret the law, not enforce Ethereum software invariants.
It just doesn't work like this.
But civil society is the opposite: Contracts cannot violate the law; the law cannot violate the constitution. The justice system would care about the terms of the DAO only insofar as those terms fail to conflict with the law, which includes a massive body of precedent in contracts and torts.
Point being, immutability is not sufficient to demonstrate that a contract is in conflict with the law.
But that's basically obvious to anyone not hinging their personal identities on peddling technocratic revolution.