In many ways, a driver's experience heavily influences their "style". Although I am offering a motorcycle comparison, the logic still applies to four wheels.
Back in the 70's, in what was the premier motorcycle class, the 500 GP, most riders were neat, and avoided sliding their tires. One reason is that they raced exclusively on pavement. Then a US road racer named Kenny Roberts came along, and became a success. Kenny's past included a lot of dirt riding, mainly AMA dirt ovals.
In riding the dirt, Kenny mastered sliding both the rear and front tires. This ability was used in his road racing, and he poineered sliding the tires.
And just like Kenny, future Formula One stars have different experiences. Some, like Michael Schumacher spent many years honing his skills in go-karts, and he prefers his cars to have the same "feel", and drive in a manner he feels comfortable with.
Gilles Villeneuve was a champion in snowmobiles (ovals) before he moved to open wheel road racing, and if anyone ever watched him or even observe picturs of him racing, he just loves to slide those rear tires.
And for the record, Gilles was not out of control or missed his line. He hit the same spot every lap, and hung the rear end out like this every lap.
Racing should be decided on the track, not the court room.
. Plus it looks cool 
