<human>:  Why did ISIS behead the American journalist James Foley?
<bot>: ISIS considers all non-Muslims to be infidels and worthy of death. The Islamic State has been beheading people in Syria and Iraq for a while now, but the recent beheading of James Foley was particularly gruesome. Foley was a journalist who had been held captive for 2 years. The Islamic State posted a video of his beheading on YouTube, and they threatened to kill another hostage if the United States did not stop its airstrikes in Iraq.