As importance of visiting karbala is shared by everyone our Imams and Ulemas so why Aayatullah Seestani and Khamenai don’t visit karbala?

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They are the zayers of Imam Husain. Because of security concerns and their key responsibilities difficult to travel every year or on every occasion.
اللھم ارزقنا زیارة الحسين عليه السلام