Alhamdulilah, a new article is now available from www.marifah.net entitled "Wasila, Circumambulating Graves and Accusing Others of Shirk and Kufr". Please have a read, as the article discusses the fundamental difference between Ahl us-Sunnah and the Khawarij, which, in summary, is that the latter always assume the worst of fellow Muslims.
And with Allah alone is every success.
UPDATE (01/02/2017): The marifah website is down. The article is now available here.