I don't mean they never learn to self-soothe, but the article was pretty convincing on the point about kids learning to cope if they had to handle a disappointment on their own: the more practice, the better. Since your son is 10, you could talk directly with him about that point and coping mechanisms like taking a deep breath, walking a few steps, etc.
I would usually try to help my son if he was crying in frustration, sometimes by distracting him and sometimes by letting him try again, etc., but now that he's 4, I've been reading that it's time for him to learn to cope with disappointment himself. One can't always run interference for one's kid, and apparently it's not very good for them after a while to do much of it because they don't get a sense of themself as autonomous and don't learn to self-soothe.