Final answer:
John Byro possibly believed the boys due to their demeanor or inherent goodness, and Aram and Mourad may have returned the horse because of guilt, responsibility, or an understanding of their actions' impact.
Step-by-step explanation:
The question pertains to the reasons behind characters' actions and beliefs in a story. It seems that John Byro trusts the boys, possibly due to their honesty or innocence, or maybe he perceives an inherent goodness despite their actions. Their decision to return the horse could stem from a sense of guilt, responsibility, or realization of the consequences of their actions. Specific details from the text would be necessary to analyze their motives with more precision