Pity it happened before the ETP. On arrival in Singapore they would have been arrested and handcuffed, then locked up. No free lawyers, no juries. A large fine and possible caning with jail time.
In China the police would have given them a good kicking. In India they would spend months in jail waiting for the case to come up, not a pleasant experience
Arseholes like these need to be dealt with in the only way they understand.