[1] http://www.nytimes.com/2014/09/25/world/middleeast/isis-abu-...
[2] http://www.al-monitor.com/pulse/originals/2014/07/islamic-st...
This argument is so stupid.
Everyone is blaming the people responsible. That's a given. The reason people are blaming Israel and the US is because they are indirectly responsible since their actions are used as recruitment tools.
There are plenty of examples: http://www.businessinsider.com.au/the-manual-al-qaeda-and-no... http://www.cbsnews.com/videos/king-of-jordan-isis-used-gaza-...