1) McCain fully supported Bush and Cheney's war in Iraq that destabilized the region in search of WMD's that did not exist.
2) McCain did not protest when Bush and Cheney installed an Iran-friendly Shia government thus excommunicating Sunnis from the government and military.
3) McCain did not object when Nouri al-Maliki, the new Bush Cheney installed President, severed pensions to former Sunni government and military officials and then sought revenge against those Sunnis who served in the Saddam government.
4) McCain seems to forget that Bush and Cheney's military had the future leader of ISIS, Abu Bakr al-Baghdadi, imprisoned at Camp Bucca but released him in 2004 after he was deemed not to be a security risk.
5) McCain seems to forget that it was Bush and Cheney that negotiated the withdrawal of American troops and were unable to reach a SOFA agreement. The new Iran-friendly Shia government that they installed wanted the troops out and refused to allow Blackwater to continue their atrocities without due Iraqi legal recourse.
6) McCain seems to forget that he and his fellow Republicans have ignored the President's request of 18 months ago to Authorize a Use of Force in the region. In other words, the Republicans have refused to declare war against ISIS because of the political risks created by Bush and Cheney's original poor decision in Iraq.
7) Cheney ignores the fact that, like the Fort Hood shooter and the Boston Marathon bomber, the FBI had the Orlando shooter under investigation and closed the investigation and walked away.
CONCLUSION: IT'S CLEARLY ALL THE BLACK GUY'S FAULT