In light of the expiatory jihadist groups' terrorism against Syria and under the unlimited support from the United State, Turkey, Saudi Arabia and many other countries, this study tries to shed light on the ideological background of the terrorism of these groups and on the most important factors that led to the spread of their thoughts globally and within Syria. It also talks about how double standards has played a role in the international dealing with the terrorism in Syria and in its continuation and increasing. This research found that the jihadist groups depend – in their approach – on the legacy of ''the Muslim Brotherhood" and on the Wahhabi expiatory thought. It also found that ignorance, unemployment, the media and the financial support from Saudi Arabia and from the West are the most important factors of the spread of expiatory thought. Besides, countries that support these groups invest their terrorist activity either to achieve their interests or to preserve them.