Final answer:
Santiago went through the dangers of tribal wars to reach the pyramids as a test of his commitment and determination. The alchemist left Santiago alone to complete the journey as a test of his character and self-reliance.
Step-by-step explanation:
Santiago had to go through the dangers of tribal wars on the outskirts of the oasis in order to reach the pyramids because it was a test of his commitment and determination to fulfill his Personal Legend. The tribal wars represented the obstacles and challenges that Santiago needed to overcome in order to achieve his goal. By facing these dangers, Santiago demonstrated his bravery and perseverance, proving that he was worthy of finding his treasure.
The alchemist left Santiago alone to complete the journey because it was another test of his character and self-reliance. The alchemist wanted Santiago to prove that he had the courage and wisdom to follow his own path and make his own decisions. By leaving Santiago alone, the alchemist was giving him the opportunity to demonstrate his independence and trust in the guidance he had received.