Personally, I don't believe for a minute that the local JWs did Sweet Fanny Adams to contribute to the broader community during the war. They are the only religion to be banned by the Australian Government for the obnoxious way they were carrying on while the country was at war. This looks like a story they made up to try and look good to the broader community, and the apology (for something I don't believe happened*) was both to thumb their nose at said broader community ("We're sorry we helped you ungrateful sods; we won't do it again!") and to cement the anti-war anti-government stuff in the eyes of the faithful.
*I'm willing to accept true evidence, not this publicity stunt.
Edited to add: I'm doubting that first paragraph, p. 172. What came before that paragraph, so that there is some context?