I agree with your assessment that most of the world is trying to be "politically correct" by not mentioning the words "terrorist" and Islam. But I think that another large part of the reason for not using such labels is that people are rightly afraid of offending Muslims because they know the kinds of reactions that will follow
I disagree with your opinion that these "Islamists" have bastardized a religion. The root of the problem is Islam itself. All of Islam tolerates such behavior, much of Islam supports terrorism and many imams call for Muslims to murder infidels. These are the facts based on reality, not based on the public relations people for Islam. Ten percent of Muslims identify themselves as Islamists. That is over 150 million Islamists. These people are the "military" for all of Islam to use in foring Islam on the entire world. The one billion plus other Muslims are quite content to let the 10% get blamed for murders and other atrocities. The 10% are spreading Islam through fear, scaring non-Muslims into silence lest they be the next victim, while the 90% who support them are living among us, happy that Islam has sunk it's cancerous roots into Western civilization.
I suspect that many of that 90% are upset with the murderers from their ranks who are spoiling the plan to win against non-muslims by means of the war going on in the bedrooms of our world, including the USA. I really feel that that is the war that is more threatening to us.
I assume that you get the drift. Jim