In moments of profound crisis, when an entire nation sinks into despair and rebels against its destiny, true leadership requires standing firmly against the tide. Two leaders step forward during such a rebellion, but their response does not begin with speeches. Instead, they perform a sudden, symbolic act to express their deep shock. Joshua is mentioned before Caleb due to his higher spiritual standing [אבן עזרא]. He is also the one who feels the most intense pain over the sorrow of Moses, the failure of their mission, and the tragic mistake made by the people [רש ר הירש].
The fact that these two men were among the spies who explored the land explains why they are the ones who take action rather than the other community leaders. Their intervention does not come from a place of superiority. Rather, having seen the beauty and goodness of the land with their own eyes, they are uniquely pained to hear it slandered [אור החיים, ביאור יש״ר]. Furthermore, they deeply understand the true nature of the territory. Unlike Egypt, which operates strictly according to the laws of nature, this land is under God's direct, personal supervision. Because of this, it rejects sinners but yields tremendous good for those whom God desires [מלבי״ם].
As soon as they see the dangerous direction the events are taking, their immediate reaction is to tear their clothes [רש ר הירש]. This dramatic action is meant to shock the people, illustrate the gravity of rejecting the land, and publicly contradict the false reports of the other spies [אור החיים]. The tearing of their garments is a direct response to the complaints of the people and their leaders, which amount to blasphemy against God. Religious law dictates that a person who hears such cursing is obligated to tear their clothes [ביאור יש״ר, העמק דבר]. They choose this physical expression of grief rather than starting a debate because logical arguments hold no value against such severe heresy. Recognizing the futility of reasoning with the crowd, they leave the judgment of the rebellious group entirely in His hands [העמק דבר].