Isis in Iraq

There is a new player in terrorism in Iraq known as Isis:

http://www.theguardian.com/world/2014/jun/16/iraq-isis-takes-tal-afar-us-iran-vienna-nuclear-talks

Question:
Is the U.S. happy about this?

Lesson 1:
If Saddam Hussein was still alive this would not be possible.

Lesson 2:
There are rumours of Americans that they wish the U.S. never went in to do the will of the neo-cons to get regime change.

It was once an axiom uttered by Sir Winston Churchill that if go war you will never know what will be its outcome(s).