Trump is a jerk. and he makes a million promises and keeps like 10. He isn't the type of person that is afraid of looking bad because he broke a promise, he's more likely to use a peace prize to justify violence because after all, it has to be someone else's fault since he has a peace prize awarded to him.
Maybe there should be other prizes for life time achievement or something, but the Nobel committee seems to be intent on promoting peace instead of giving kudos to someone.
I think neither obama or trump qualify, even to promote peace. it implies that they are law makers. in the US, the president is supposed to be an executive that takes actions, not a legislator that has the power to start or end wars. Treat them like kings and be surprised when one of them dumb enough to think he actually is one starts acting like it. that's the state of things unfortunately.