“If the Yazidi men had known the peshmerga would withdraw, they might have fled earlier as well. Alone, they were no match for the IS army.” thedailybeast.com

“The Kurdistan Workers’ Party (PKK), a U.S.-designated terrorist organization, has promised to evacuate the Sinjar area of northern Iraq once the Islamic State ceases to be a threat to the local Yazidi population. This statement follows days of reports that internal disputes between the PKK and other Kurdish groups have stalled a planned assault on ISIS.”

http://www.breitbart.com/national-security/2015/11/09/intra-kurdish-disputes-hold-up-efforts-to-save-sinjar-iraq-from-isis/

Related article:

http://www.thedailybeast.com/articles/2014/08/17/how-the-u-s-favored-kurds-abandoned-the-yazidis-when-isis-attacked.html