BCX can't go to jail for mining a coin. It just so happens that he can be more than 51% of most network hashrates. Forks happen all the time its the nature of the beast. Perhaps people are stupid for putting a multi-million dollar valuation on a blockchain that can be forked by such little hashing power.
I see nothing wrong with this.
AUR has a value established by free markets. You see nothing wrong with deliberately destroying or degrading that value out of malice?
If Icelanders come to value this windfall and then BCX deliberately damages the value of their holdings, I could see a hue and cry from the Icelandic population demanding that their government do something. It would not be hard to imagine them charging him with any manner of infractions having to do with property damage, vandalism, financial wrongdoing, you name it - and seeking to extradite him.