To be fair, Nobel Prize has a history of expanding the traditional bounds of respective fields when awarding the prizes:
Bertrand Russel got the Nobel prize in literature
Daniel Kahneman got Nobel in economics
Bertrand Russel got the Nobel prize in literature
Daniel Kahneman got Nobel in economics
- Wikipedia
(Admittedly, even more broadly, the prize was the Nobel Committee wanting to acknowledge his leadership in WW2, but still.)
Not against nor in favor, it was just an unexpected awardee.
Content of his character indeed.
The list of war crimes I can pin on US during that time is mostly indefinite imprisonment in Guantanamo if you allow for the efforts Obama made to reduce torture.
https://www.hrw.org/news/2017/01/09/barack-obamas-shaky-lega...
Drone strikes are not war crimes according to this definition:
There's quite a few.