Turks are a low-cost enemy object for many Western nationalists. They can't attack the English, the German, the French, or the Russian with the same ease; because each has their own historical weight, trauma, and counterarguments.
But when attacking the Turk, there's a ready-made package: "Ottoman invader," "Islam," "Constantinople," "kebab," "Europe under siege."
Because to sustain the fake pan-European identity, they need a common enemy. European history is in reality filled with Europeans killing each other, invading, sectarian wars, and colonial rivalries.
That's why the romance of fighting against the Ottomans is the most useful fairy tale for modern European identitarians. It's not real history; it's selected trauma and internet propaganda.