The cause of ISIS is Islamic extremism.<p>Not income inequality. Not climate change. Islamic extremism.<p>Those who claim otherwise are merely playing politics to advance political agendas.<p>Sam Harris, the well-known atheist author and speaker, describes such people well[0]:<p>&quot;These people are part of what [Muslim reformist] Maajid Nawaz has termed the “regressive Left”—pseudo-liberals who are so blinded by identity politics that they reliably take the side of a backward mob over one of its victims. Rather than protect individual women, apostates, intellectuals, cartoonists, novelists, and true liberals from the intolerance of religious imbeciles, they protect these theocrats from criticism.&quot;<p>To say the problem with ISIS is anything other than Islamic extremism is a red herring. In this case, Piketty has long been advancing his political agenda regarding income inequality. He is merely playing politics here, using the ISIS problem to advance his agenda.<p>[0]: <a href="http:&#x2F;&#x2F;www.samharris.org&#x2F;blog&#x2F;item&#x2F;sam-harris-the-salon-interview" rel="nofollow">http:&#x2F;&#x2F;www.samharris.org&#x2F;blog&#x2F;item&#x2F;sam-harris-the-salon-inte...</a>