Always think positive but prepare for the negative.
Discussion
Can you prepare for the negative if you didn't think of it before? I'd say no.
So in order to be prepared you'd have to think negatively first.
Like with moto. Ride to keep the rubber side down, dress for sliding down the asphalt on your back.
And with moto, your focus is important. Target fixation guarantees the crash. Place your focus on where you’ll exit the turn after the apex and trust your machine and manage your frictions. Focus is on the positive. But you’re still dressed in thick leather-clad armor, just in case. (That’s me. Photoshopped by a buddy.)

Yes, as a winners all you think about is finishing the track or winning the race etc.