What is the speaker of Killers in Our Midst trying to persuade the audience of apex?

In "Killers in Our Midst," the speaker aims to persuade the audience of the pervasive threat posed by individuals who blend into society while harboring malicious intentions. They emphasize the importance of vigilance and awareness, urging listeners to recognize the signs of danger that may not be immediately apparent. By highlighting real-life examples, the speaker reinforces the idea that such "killers" can exist among us, challenging the audience to confront their assumptions about safety and trust in their communities.