It’s a non-interventionist mindset
By 
This seems about right:
If Donald Trump gets his wish, he’ll soon take the three convicted or accused war criminals he spared from consequence on the road as special guests in his reelection campaign, according to two sources who have heard Trump discuss their potential roles for the 2020 effort.
Despite military and international backlash to Trump’s Nov. 15 clemency – fallout from which cost Navy Secretary Richard Spencer his job on Sunday – Trump believes he has rectified major injustices. Two people tell The Daily Beast they’ve heard Trump talk about how he’d like to have the now-cleared Clint Lorance, Matthew Golsteyn, or Edward Gallagher show up at his 2020 rallies, or even have a moment on stage at his renomination convention in Charlotte next year. Right-wing media has portrayed all three as martyrs brought down by “political correctness” within the military.
“He briefly discussed making it a big deal at the convention,” said one of these sources, who requested anonymity to talk about private conversations. “The president made a reference to the 2016 [convention] and where they brought on-stage heroes” like former Navy SEAL Marcus Luttrell, who refused to execute detained civilians ahead of a devastating Taliban attack.
The man knows his base. And it’s hardly something that started with Trump, either — cf. tenured professor John Yoo.