It seems like it was more complicated than that:

> He found refuge, at first, in family life. In his early 20s, while stationed in Belfast, he met a local woman and had a child with her, Adam. In 1995, though, the marriage crumbled while the Bushbys were living in Hampshire, England. Adam and his mother returned to war-torn Belfast, where Karl, as a British soldier, was forbidden to visit. He found himself “alone, wondering where my life was going.” He created for himself the ultimate challenge: a journey that would show his paratrooper mates he was no runt.

He didn't leave until 3 years after he'd already been separated from them.

I'm not saying it's good that he didn't try to have more of a relationship with his son, obviously not. But it seems like it was already a complicated and broken relationship with the mother, across countries. Going on his trip wasn't walking away from an otherwise functional family.

https://archive.md/20250528132130/https://www.washingtonpost...