"By the overwhelming presence and overwhelming number of people here today, they're sending a message to you loud and clear that John and Matthew's lives mattered, that they were noticed on this earth, they were loved on this earth and they were valued on this earth," Penna said. "This robust crowd wants you to know that they're here to tell you, all of you, that they love you, too, and they have your back and they're here to support you in our loss."