He was awarded the prize in the hope of influencing him to actually promote peace in the future.
The idea was that accepting the peace prize would have led Obama to see himself as a Nobel peace prize winner, and thus as someone promoting peace, and that he thus would subconsciously actually try to promote peace to avoid the cognitive dissonance.
It didn't work as well as it could, but maybe it worked to some extent.
No. It actually didn't work at all. The war in Iraq ended for Americans, but it's still a hell hole for the people who live there. Afghanistan will be the same.
He has brought international relations to a new low.
Quite a bit of it isn't directly his fault, but he has done little to improve the situation.
The idea was that accepting the peace prize would have led Obama to see himself as a Nobel peace prize winner, and thus as someone promoting peace, and that he thus would subconsciously actually try to promote peace to avoid the cognitive dissonance.
It didn't work as well as it could, but maybe it worked to some extent.