I think the argument would be that formerly corrupt enforcement entities, or entities with no track record, would use a blockchain as proof of their commitment to impartial enforcement going forward. "We know you don't trust us, but here is a public record that you know we didn't manipulate, so if we are going to steal your land we have to do it openly."

That said, the same thing can be accomplished by outsourcing the public ledger to a third party with a reputation for trustworthiness. The same way that countries that cannot make a credible commitment to not devalue their money will often peg their currency to the dollar or the euro.