Incompetence can happen anywhere. I once had a copilot come extremely close to killing me and a planeload of 767 pax.
1. Marine helicopter pilot trained by the Army = NO fixed wing time and no previous civilian time
2. Hired at my company as a 727 flight engineer = NO fixed wing time
3. Upgraded to DC-10 FE = NO fixed wing time
4. Upgraded to B-767 International copilot - flew required minimum time with a check pilot and was turned loose.
I was unfortunate to get him off the reserve list for his first trip on his own. Without going into any of the details, something (caused by him) so frightening happened that I bypassed the pilot union and went directly to the chief pilot's office....
It's amazing how well CAT IIIB works just like the simulator. The wind normally has to be zero to provide such weather conditions. For lack of better terminology, they are "quiet" approaches. I've made several in 767s at Zurich among other places.