Until the West's Government leaders, and Media, acknowledge the elephant in the living room - that the problem is Islam - never. The Koran not only encourages such wicked actions, it commands it.
Islam cannot coexist with others. It must subjugate or destroy those who don't join its cult.
Our Governments refuse to recognize (or at least admit) the obvious.
A significant percentage of Muslims are sympathetic to such terrorist atrocities as Manchester, a minority to be sure, but more than enough to fuel terrorist recruitment into the distant future.
The only one who has ever spoken out on the danger has been so far President Trump.