WW,
You must be some kind of flying genius and certainly don't belong on a flight deck but in charge of worldwide aviation safety. I've taken wrong taxi-ways about 6 times in 15 years of commercial flying thankfully without incident. I would hazard a guess they were distracted and will hold their hands up and say they screwed up. On most wide-bodied aircraft it is difficult to see the wing tip and even if you can, it is harder to gauge if it will impact on something. It doesn't make them incompetent, it makes them human like the rest of us. The Skipper I would imagine has a great deal more experience than you and doesn't hold his position through luck or good fortune.
I suggest you engage your brain in future before writing such condemning passage.