This past week has been dominated by comments by the president in which he continues to insist that the brutal acts of violence by the Islamic State (ISIS) and other Islamic terrorist groups are completely unrelated to Islam, to the point that he and his administration look absurd in their efforts to avoid using words like “radical Islam” or variations of it.

Let me explain why there’s more to all this than simply semantics, starting with this proposition: Engaging in acts of deception and self-deception is unwise. Yet that is precisely what Mr. Obama is doing. He persists in putting forth a false narrative that he insists is a true one. And then there is the supreme arrogance of the president, assuming that his pronouncements about Islam will be received by the Muslim world like pronouncements of the Pope will be received by the Catholic world. Of course, this is a man who declared that if elected president he would stop the rise of the oceans and heal the planet, so it shouldn’t shock us that he believes his shallow and incomplete theological interpretations of Islam will carry weight across the Islamic world.

Memo to Mr. Obama: They won’t. Having you lecture the Islamic world about the true nature of Islam actually strengthens the jihadists, who will be thrilled to get in a theological debate in which the Christian president of the United States offers one view and Islamic jihadists and imams offer another.

You might also think an American president would understand that in order to defeat an enemy you need to understand the nature of the enemy you face; that in order to win a war, you need to understand the nature of the war you are in. But you would be wrong. Mr. Obama understands neither, which explains why he’s so inept at prosecuting this war and why the Islamic State is extending its reach beyond Syria and Iraq into nations like Algeria, Afghanistan, Yemen, and Libya.

The president, then, is utterly clueless and misdiagnosing the problem. Think if you had a pain in your chest and assumed it was heart burn when it was a heart attack. That would be a problem, since to address the threat you have to diagnosis it correctly. When it comes to Islamism, Mr. Obama is badly misdiagnosing the threat we face.

If it were merely a matter of semantics, it would concern me less. If he were waging this war successfully, with intelligence, purpose, and focus, and an unbreakable will to win, he could refer to ISIS as the Islamic version of the Quakers–even, as absurd as it sounds, as a “jayvee team”–and most of us might be willing to overlook it. But in this case, the president’s flawed semantics are a manifestation of a badly confused mind and a fundamentally flawed worldview. And this, in turn, is causing him to downplay the threat we face.

As a result of this, Mr. Obama is waging this war (his attorney general insists we’re not at war) in a half-hearted, going-through-the-motions fashion, constantly putting constraints on what he’s willing to do to confront ISIS specifically and militant Islam more broadly. For example, the president, in sending Congress a use-of-force resolution against ISIS, wants to put into statutory language that Congress “does not authorize the use of the United States Armed Forces in enduring offensive ground combat operations.” He announced the surge of forces in Afghanistan–and declared in the very same speech a withdrawal date. By bungling the Status of Forces Agreement, we ended up withdrawing American combat troops from Iraq, which has led to a descent into chaos and violence. The president was told by many members of his national-security team to support the moderate opposition in Syria, yet he refused until it was too late. He declared the overthrow of Muammar Gaddafi to be a great success, only to ignore Libya, which is now a failed state and a haven for jihadists. In interviews, Mr. Obama continually underplays the threat we face. And minutes after speaking about the beheading of an American by ISIS, the president, in a staggeringly inappropriate display, hit the links for a round of golf. In all these actions and more, he is advertising his unseriousness and weakness to our enemies and our allies, many of whom no longer trust us.

To be sure, militant Islam is not a dominant current of thought within Islam. But it is a current of thought that exists and is particularly malevolent and virulent. If Mr. Obama understood this, he might be more prepared to combat it and defeat it. And defeating it on the battlefield is, at the end of the day, the best and really the only way to delegitimize it in the Muslim world. To show them and the world, including the Islamic world, that we are the “strong horse” and they are the “weak horse.”

The president should get on with this task. But we’ve all seen enough to know he won’t. As a result, much death and great horror will continue to spread throughout the world, and eventually, I fear, to America itself.

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