Hilaire Belloc in his book 'Survivals and New Arrivals' writes (and warns) a bit on Nationalism:
"But the essence of Nationalism, in its present form as a menace to religion, lies in this: that the nation is made an end in itself. When that mood appears, there is present, in the strictly technical sense of the word, Heresy; there is present false doctrine, and all the dangers of spreading and ramifying evil which spring from false doctrine as from one poisonous seed."
"Let us take a few tests and judge by them the quality of the thing."
"Go to a public park on two successive Sundays. On the first, stand upon a chair and declaim at length against the discipline of religion. Ridicule the doctrine of the Trinity, the Incarnation, the right of a Christian society to enforce the practice of Christian ritual. Nothing will happen to you."
"On the second Sunday get up on a chair and declaim at equal length and with equal zeal against the country and its conduct in the late war. Praise enthusiastically some more specially unpopular foreigners-enemies for choice-laugh at the heroism of the troops, call them cowards and go on to denounce with vigor the obedience rendered to their officers and soldiers and sailors. A great number of things will happen to you. Even after the police have rescued you from the hands of the mob, the State will proceed to deal with you in a fashion which will enlighten you for good upon the limits of toleration."
written in 1929. Imagine what would happen if one were to 'take the test' that Belloc mentions above today.
What do you think would happen? I think, nothing would happen to the speaker in both cases. A veteran or two will swallow hard and move on.