All right everyone, calm down. Take a deep breath, let it in, let it out. It's not an educational show (entirely), it is for entertainment. Just because they didn't draw the dude with both hands on the wheel, doesn't mean they don't know, doesn't mean it matters. They drew him like they did for an image they wanted to portray. Why? I don't know, that's how life works.
As for many of the races, explain this real life scenario:
My friend in his STOCK WRX (not STi) beat a modded SRT-4. With the weight difference and work done, the SRT-4 should have easily won, why didn't it? Driving ability is so important. No one realizes that you could have 15,000,000,000 WHP and lose to a go-cart if you can't drive.