Why does mr aarons tell jess is the cause of Leslie death?

Mr. Aarons tells Jess that Leslie's death was caused by the floodwaters from the creek, which were a result of the storm. He emphasizes that tragic accidents can happen, suggesting that it was not anyone's fault but rather a cruel twist of fate. This conversation highlights the themes of loss and the randomness of life, as Jess grApples with the suddenness of Leslie's passing.