Why call those who fight for ISIS “Americans”?

They are not Americans; they are radical Muslims who currently live in America. I'd go one step further and ask are there any Muslims in this country who consider themselves "Americans"? I'd really like to know, please.

Legal Insurrection  "It’s really just common sense: “Americans” who leave this country to fight for ISIS, or any other country or entity or group who is our enemy, should no longer be referred to as “Americans” by the press.

"I know; fat chance. " ...

 

... "the relevant statute is here. These portions seem especially apropos:

(a) A person who is a national of the United States whether by birth or naturalization, shall lose his nationality by voluntarily performing any of the following acts with the intention of relinquishing United States nationality—
(1) obtaining naturalization in a foreign state upon his own application or upon an application filed by a duly authorized agent, after having attained the age of eighteen years; or
(2) taking an oath or making an affirmation or other formal declaration of allegiance to a foreign state or a political subdivision thereof, after having attained the age of eighteen years; or
(3) entering, or serving in, the armed forces of a foreign state if
(A) such armed forces are engaged in hostilities against the United States, or…
(7) committing any act of treason against, or attempting by force to overthrow, or bearing arms against, the United States, violating or conspiring to violate any of the provisions of section 2383 of title 18, or willfully performing any act in violation of section 2385 of title 18, or violating section 2384 of title 18 by engaging in a conspiracy to overthrow, put down, or to destroy by force the Government of the United States, or to levy war against them, if and when he is convicted thereof by a court martial or by a court of competent jurisdiction.

 SAUDI KING: JIHADISTS WILL REACH WEST 'IN MONTH'
"If we ignore them, I am sure they will reach Europe in a month and America in another month," he said in remarks quoted on Saturday by Asharq al-Awsat daily and Saudi-backed Al-Arabiya television station.