Donald Trump's absolutely doing the right thing by trying to bail out LiAngelo Ball and his UCLA teammates after their shoplifting arrest in China -- so says Kenyon Martin.
"That's his obligation. That's his responsibility," K-Mart told TMZ Sports ... when we asked him about POTUS hitting up Chinese President Xi Jinping to resolve the situation.
The ex-NBA star says LiAngelo and his bros are only guilty of being young and dumb .