That's an easy "yes".
In the UK, for the most serious (indictable-only) crimes, then no. But you can ask the judge to end the trial after the prosecution case if no reasonable jury could convict, including if as a matter of law no crime has been committed.
The DAO was created with the intention to allocate its funds according to a certain voting scheme, with everyone's power determined by the number of tokens they held. But the program did not correctly implement this intention, and the DAO hack exploited the difference to bring the funds under control of the attacker. This most likely violated the Computer Fraud and Abuse Act, and was thus illegal.
That doesn't mean that it is legally binding.
But the question that is to be debated is, was the intention of the DAO too follow the code of the contract EVEN IF it had a bug.
There is an argument to make that, given that "the code is law" was plastered all over the DAO, that being hacked and having all their money stolen, was explicitly allowed.
Without getting too abstract, even traffic lights or zebras, from the perspective of a pedesetrian, (as an example of a simple system) would be a horrendous and extremely time consuming experience if its rules were enforced by the letter. Imagine if you could >only< pass the road accross the zebras...
Human made systems need to be imperfect and the rules need to be flexible or the system will fail.
Even countries that don't have shared extradition treaties don't always ignore criminals within their borders, even if the criminal activity is occurring outside.