I don't know what people really want from him. Everybody knows the primary reason he left was the Heat were the best winning situation, but of course he can't admit that publicly since the Celtics were ostensibly still "going for it." Would him admitting that really make Celtics fans feel better?
Sure I wish he would stop talking about it, but at the time the criticism was intense. Not offering some logical-sounding defense would have just condemned him forever. Maybe he has justified it in his mind by convincing himself he really was mistreated beyond reason, but that's just par for the course when it comes to athletes.
I don't think Ray owed me, a fan, anything more. We've already established that he didn't owe the Celtics organization anything.
The only question is, did he owe his teammates, coaches, and especially Pierce and Garnett something more? I would think so, but since we don't actually really know any of these people or their relationships I can't sit here and comfortably throw terms like "traitor," "ego," or "narcissistic" around.