Was China right?

Do you agree with the decision made by the Chinese government to execute Akmal Shaikh for drug smuggling? According to the family of Mr Shaikh, he suffered from bipolar disorder and this was not taken into account by the Chinese judiciary. Friends of Mr Shaikh claimed he lived in a fantasy world and said he was duped into travelling to China on the premise of making a record. He was given a suitcase to take with him in which was hidden 4kg of Heroin. This begs the question of whether Mr Shaikh knew what was in the case or not. We do not know what he was told by the people who gave it to him. I know what I would do if I was given something to take to another country, especially one that has strict drug laws. But if someone gave you a case that you trusted implicitly would this influence your decision or not? This case also throws up the debate about capital punishment. Is executing guilty drug smugglers the answer to stemming the ever increasing problem of drugs? What's your slant on it?