You gotta name the enemy before you can fight him effectively. Obambi refused to name them and they took over Iraq, Syria, Libya, Yemen, and other places. The Trump administration is calling them radical Islamic terrorists.
Democrats and even some Republicans object that the word Islamist makes Muslims worldwide feel we are persecuting them. Which has some truth to it. But what else to call them? In the past, we called enemies by their ideology (Nazi, Commie, Fascist). Far as I can see, this enemy's ideology IS Islam and so calling them Islamic is fair enough.
I suppose we could call them Jehadis. Except that word doesn't carry enough juice to be a biting epithet. Using acronyms, ISIS, ISIL, AQAG, also doesn't seem to cut it. Using their own names like Al Quaeda suffers when they stop using the name themselves.
Perhaps we could call them scumbagies?