The author doesn't see the contradiction in his statement. He is making a distinction without a difference.
Doublethink.
"But the whole universe is outside us. Look at the stars! Some of them are a million light-years away. They are out of our reach forever.""What are the stars?" said O'Brien indifferently. "They are bits of fire a few kilometers away. We could reach them if we wanted to. Or we could blot them out. The earth is the center of the universe. The sun and the stars go round it."
Winston made another convulsive movement. This time he did not say anything. O'Brien continued as though answering a spoken objection:
"For certain purposes, of course, that is not true. When we navigate the ocean, or when we predict an eclipse, we often find it convenient to assume that the earth goes round the sun and that the stars are millions upon millions of kilometers away. But what of it? Do you suppose it is beyond us to produce a dual system of astronomy? The stars can be near or distant, according as we need them. Do you suppose our mathematicians are unequal to that? Have you forgotten doublethink?"
—1984, by George Orwell
Doublethink is the act of simultaneously accepting two mutually contradictory beliefs as correct, often in distinct social contexts. Doublethink is related to, but differs from, hypocrisy and neutrality. Also related is cognitive dissonance, in which contradictory beliefs cause conflict in one's mind. Doublethink is notable due to a lack of cognitive dissonance—thus the person is completely unaware of any conflict or contradiction.
Not all Muslims are jihadists. Many are born into the religion and simply don’t take it that seriously. The only good Muslims are bad Muslims.