The report does a good job of describing just how quickly problems can escalate in aviation.
Especially if somebody departs without having looked at the weather.
That approach works suprisingly often - because in general so long as you can "somehow" get airborne, you can have a "look around" when you are up there, and the statistical nature of a lot of weather means that "ways" can be found to proceed. That's why so many numpties get away with it. And also why some very experienced pilots manage to do flights in awful weather, but they have a smarter strategy - like not flying below the terrain...