Just an opinion. If a person were to speak up (louder than ISIS and other violent groups) for Islam and its true love of peace, and gain support for speaking up, then the public eye may view the religion in a better light. If there is already someone like this out there, please let me know. I am not Muslim, but I do support those who are Muslim. [spoiler]sorry for the religion post, just happened to be on my mind.[/spoiler]
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With the divide of Sunni/Shiite, the leader can only speak for one side. Plus it will cause more division in the already strong rivalry.