I am not defending either of them. They are kids. For them it's not that deep. It's very ..quid pro quid. In Rik's case - jin betrayed him by siding with his family. He sort of equated both their situations, because jin does have it better - in his case his survival isn't being threatened, he is being tortured yes, but it is way worse in Rik's case (again this doesn't justify what he is doing). So it's part jealousy, part betrayal, and some part of it I just pain and a cry for help because he has just lost his only family in the form of jin.
I am not defending either of them. They are kids. For them it's not that deep. It's very ..quid pro quid. In Rik's case - jin betrayed him by siding with his family. He sort of equated both their situations, because jin does have it better - in his case his survival isn't being threatened, he is being tortured yes, but it is way worse in Rik's case (again this doesn't justify what he is doing). So it's part jealousy, part betrayal, and some part of it I just pain and a cry for help because he has just lost his only family in the form of jin.