Why not ask his son, who has joined him on sections of his walk, or at least read the abundant press coverage about the two and why Bushby was unable to follow his infant son to Northern Ireland?
Within the overland-travel community, Bushby comes up often enough and people actually talk about his walk, getting visas, crossing borders, interacting with local people. It's a good demonstration of how toxic general social media like Reddit (or, now, HN) is for substantial discussion that people try to move the discussion instead to the personal merits of the person.
As a retired cycle tourist myself who hosted a few world-spanning cyclists and a friend of a well known late Italian Vespa globetrotter, I would say: this is actually the critical audience (often subconsciously) personally justifying why their own life is so boring: "my way is the right way: everyone else is irresponsible". Deep down they feel threatened by the notion that their life may be boring BECAUSE OF THEIR OWN DAMN CHOICES. News at 9.
But yeah, they are all half-mad or worse (read: "interesting people"); military service isn't going to have zero impact either, people deal with it different ways.
I find it telling he doesn't have flags on his kit.
No matter what, a kid needs his parents as a kid (in normal healthy families). There is not a case that I can imagine where not having them is good.
The fact that he gtew up to be a man much, much more mature than his father just shows he is the better person. And absolutely nothing on the father.
“Temporarily unable to go to Northern Ireland” doesn’t justify abandoning your child for the entire rest of his life.
There’s no way to spin it so that Bushby isn’t an absentee father and a selfish person.
The stories where bad parents just swoop in late in childhood and have a great relationship with their kids is frustrating. As a parent you would like to think the monumental task of raising a newborn from birth through the first 5 years would create some kind of lasting connection between you and your kid.
It is a ton of sacrifice and they won't recognize it until they have kids themselves. The reality is they can resent you as a teen and become endeared with a step or absent parent if they are more "fun" in the moment.
He couldn't go to Belfast because he was active duty in the British military.
But, he left the army to do his around the world walk, which means that he could have left the army and gone to Belfast instead.
He and his adult son have a good relationship now seemingly, but that doesn't mean his son didn't need a dad growing up. Having said that, it seems like this dude had a whole slew of mental issues, so perhaps it was for the best that he wasn't around his son much while he was growing up.