Is Vessantara Jātaka in conflict with morality?

Is there any convincing interpretation of [Vessantara Jātaka](http://www.sacred-texts.com/bud/j6/j6013.htm) that isn't in conflict with morality? Vessantara gave away his children to serve as slaves for no particular reason; it is not clear how not giving them away would hinder his own awakening. I can see how one might argue from the Buddhist perspective that attachment to one's children and anger towards their oppressors is a bad thing. One can, however, protect one's children from oppressors in a completely detached way, without generating any attachment or hatred. Moreover, it's not that he just didn't resist; instead he actively looked for his children when they had run away, in order to give them away to Jūjaka. All in all, Vessantara's behaviour caused a lot of suffering to his children for no reason whatsoever, and he not only didn't get condemned, but was even presented as the one who did the right thing. Is there any way to reconcile this story with morality?