This is a weird trend I've noticed reading a lot of WW2 comics - I've seen a bunch of examples of heroes fighting Nazis in Europe who, at a certain point, get transferred over to battling the Japs in the Pacific, since that's more marketable.
I understand why this happened, but the implied racial politics make me deeply uncomfortable.
More importantly, what's going on with the story? Burp hears people talking about bombing and assumes it's 'filth' columnists, then in panel six, he's shocked to find out that they're anti-Hitler, and not saboteurs. But way back in panel two, they're talking about stopping Nazis. So why didn't that tip him off?