A lot of "may" and "might" in your reply, and absolutely no facts. The facts are that on ISIS' agenda, fighting Palestinian groups such as Hamas has a higher priority than fighting Israel [1][2], yet people in this thread still manage to "lightly" blame the Israelis, the US, basically anyone except those responsible, as if these people are incapable of independent thought.
[1] http://www.nytimes.com/2014/09/25/world/middleeast/isis-abu-...
[2] http://www.al-monitor.com/pulse/originals/2014/07/islamic-st...