Why Is Fighting Sunni Terrorists, America's Job?

[From article]

There are reasons why Sunni nations like Turkey and Saudi Arabia and the Gulf states have not committed more openly and decisively to the war on ISIS, and instead prod the Americans to send their troops to eradicate the Islamic State.
To many Sunni nations, Assad and the Shia Crescent of Tehran, Baghdad, Damascus and Beirut are the greater threat.
Indeed, until recently, as Joe Biden pointed out last October, the Turks, Saudis and United Arab Emirates were providing clandestine aid to ISIS.
Biden was forced to apologize, but he had told the truth.

[. . .]

neither the Turks nor any other Arab nation has volunteered the troops to defeat ISIS in Syria.
And if the Turks and Sunni Arabs are unwilling to put boots on the ground in Syria, why should we? Why should America, half a world away, have to provide those troops rather than nations that are more immediately threatened and have armies near at hand?
Why is defeating 30,000 ISIS jihadists our job, and not theirs?

http://buchanan.org/blog/whose-job-is-it-to-kill-isis-15567

Whose Job Is It to Kill ISIS?
Friday - February 6, 2015 at 1:55 am
By Patrick J. Buchanan