That's sorta true by definition, but I don't think it follows that the person who does this necessarily demonstrates poor piloting skills prior to this event. In some ways, it's a "blame the victim" point of view. Pilot crashes because he's a sucky pilot. Not much insight to be gained there, IMO.
The question is, why, in this situation, did the pilot display sub par aviating skills? The most common answer appears to be distraction. Something other than flying the airplane rose to the top of the pilot's priority list. In the case Oshkosh, it's probably 1) other airplanes, and 2) ATC.
The degree to which these things are distracting is related to the degree that the pilot fears them. I had a student nearly stall the airplane on final because he was frantically looking for traffic that had reported itself 10 miles away. I made the point to him that pilots are a bigger danger to themselves with their own flying than other airplanes are. And this is true about pretty much any risk.
Excessive deference to ATC can also be dangerous. With the accident in the article I posted a link to, those familiar with the case thought the stall spin had something to do with ATC asking the pilot to slow down. And there was another accident posted here a few weeks ago that appeared to be a stall/spin in a turn to crosswind that was overly aggressive in order to comply with an ATC instruction.
So my belief is that, rather than focusing exclusively on increasing stick and rudder skills, we need to remove the obstacles that prevents the pilot from using the skills that he has. One key is avoidance. Why put yourself in situations that are liable to lead to distractions? I would never fly into Oshkosh; the one time I attended the event, I flew into Milwaukee and drove the rest of the way.