India, Dec. 16 -- Nationalism in India is often reduced to speeches, flags, and slogans, but real betrayal happens quietly-between files, inside encrypted chats, and across secret meetings. The arrest of retired Air Force officer Kulendra Sharma from Tezpur, Assam, is not an isolated incident. It is another link in a long and disturbing chain where individuals in uniform, or once in uniform, loudly project themselves as patriots while silently punching holes in India's national security. History is clear on one uncomfortable truth: India has suffered more damage from "insiders" than from enemies standing across the border.

It is a harsh reality that many individuals who have served in India's defence establishments continue to carry sens...