They’re now impervious to truth. They believe (to paraphrase O’Brien from 1984) that it is impossible to see reality except through the eyes of the EU and its state media.
When they are determined to believe a lie, God let’s them.
10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
11 And for this cause God shall send them strong delusion, that they should believe a lie:
12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.