Learn from the mistakes of others. You won't live long enough to make them all yourself. Half a second in history. The airspeed you don't have. A smooth touchdown in a simulator is about as exciting as kissing your sibling.
Fuel is life.
There is a theory which states that if ever anybody discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states that this has already happened. Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. So far, the Universe is winning. In answer to the question of why it happened, I offer the modest proposal that our Universe is simply one of those things which happen from time to time.