All my writings in our site confirm what you said.
Bani Helal were the same tribes in the Karameta terrorist movements, who had destroyed and killed many towns in Syria and Iraq and invaded the Mecca and the Holy mosque killing the peaceful pilgrims there. It is the desert of Najd that usually produces savage tough warriors. From Najd came Mosaylama, (the liar) shortly after the death of the prophet Mohamed, the military movement of the Al Zing , or Negro revolution, then Al Karameta in the Abbasied Caliphate. In our modern time, Najd has produced Ibnh Abdel Wahab and his satanic religion under the name of Islam and Sunna.
Last week, I published in our site an article about it.
http://www.ahl-alquran.com/arabic/show_article.php?main_id=5462