It's hidden behind a paywall (see here if interested) but the key part comes toward the end. Douglas Murray believes that the European elites have a sense of guilt and that they think of their own tradition as being tired and played out. He goes on to write:
All these instincts, when put together, are the stuff of suicide. They spell out the self-annihilation of a culture as well as a continent. Conversations with European policy makers and politicians have made this abundantly clear to me. They tell me with fury that it “must” work. I suggest that with population change of this kind, at this speed, it may not work at all.
...Over recent decades Europe has made a hasty effort to redefine itself. As the world came in, we became wedded to “diversity.” As terrorism grew and more migrants arrived, public opinion in Europe began to harden. Today “more diversity” remains the cry of the elites, who insist that if the public doesn’t like it yet, it is because they haven’t had enough of it.
The migration policies of the political and other elites of Europe suggest that they are suicidal. The interesting thing to watch in the years ahead will be whether the public join them in that pact. I wouldn’t bet on it.
I don't think he is entirely right in identifying why the elite acts as it does, but the good thing is that an establishment newspaper has been willing to directly state the problem, namely that the European elites are determined to commit cultural suicide and that it is up to the public to resist them.