(To be clear, I don't think Trump should get one; and Obama's win was really weird. But, hey, if Kissinger can get one..)
If there's one job in the world where I'd wait until someone's well out of office before judging their impact on peace, it's the US presidency.
I'm in a circle of people who lean pretty damn far left and even at the time, the only reactions I heard were "huh, what?"
Sure, but if you want your prize to have an impact, you sometimes have to hand it out to hopefuls?
To me, it seemed oddly aspirational, but maybe that's more often the case with the peace prize, too.
Also worth noting that the language in the press release [1] and facts page [2] makes it all sound like it was for things already achieved (although maybe that's at odds with "Inspires Hope for a Better Future"), and I'm skeptical of looking at year 1 achievements the job with arguably the most destructive power in the world.
It's not a hill I'd fight, let alone die, on, though. :)
1- https://www.nobelprize.org/prizes/peace/2009/press-release/ 2- https://www.nobelprize.org/prizes/peace/2009/obama/facts/
But the Nobel price explicitly tries to avoid that; hindsight is always gonna be better.