India, Sept. 29 -- There are moments in a nation's life when the relationship between rulers and citizens is laid bare, when all the rhetoric of democracy collapses under the weight of its own contradictions, and what remains visible is naked fear. The arrest of Sonam Wangchuk in Ladakh is one such moment. To anyone who has followed his life, his work, his ideas, the very notion that he could be branded a threat to national security would sound ludicrous, if it were not so dangerous. For decades he has been known as an innovator who made the barren land bloom, an educationist who reimagined what it means to learn in harmony with one's environment, an environmentalist who turned melting glaciers into life-giving ice stupas, and above all a...