It might be hard to imagine, but "anti-war" was not "in" before The Good Soldier Švejk.

Like Diogenes, Švejk lingers at the margins of an unfriendly society against which he is defending his independent existence. "Švejking" is the method for surviving "švejkárna", which is a situation or institution of systemic absurdity requiring the employment of "švejking" for one to survive and remain untouched by it.

Jarmila, Hašek’s wife, said this
of her maligned husband:

"The honesty of Hašek’s work lies in that he would descend for his art all the way to the level of his jokes to come to understand their relation to people and things. He sacrificed himself, a mother, a wife, a child, a friend – he laid everything he had on the altar of truth – and she revealed herself to him such as she is, a laughably crippled wretch, without trinkets and without a veil."

Most people who never leave the geographical and social circuit of their own national culture and its constituent elements cannot even begin to imagine what Jaroslav Hašek underwent, as a real person, a thinking and feeling being on his anabasis through Europe and Asia between his joining the army and his return home.

What they say about Jaroslav Hašek
(on the Internet, that is ...)