It is not our purpose but setbacks are part of a Challenge. Every Challenge has its own story, every participant has his/her own story. Doing something with your car which it is never used for back home can lead to a challenge.
Thinking calmly, discussing and helping each other usually establishes a solution. But not every challenge is as difficult as the others. 25 mountain passes in 4 days is tough but traversing the Amazon is a completely different story.
The organization always supports Challengers and aims to have every participant finish the Challenge.