A whole lot of national anthems are like this. Ever read the translation of La Marseillese? There’s a line in there about marching until “the impure blood waters the furrows [of our fields].” (Technically the ridges in between the furrows, where the crops actually grow, but I don’t think “sillons” is a word used in English anymore.)
As long as they aren't endorsing political candidates, I can't say I care. Honestly, if something like that occurred near me, I'd probably go, even though I'm a staunch democrat. It's of historical significance, and the stories I'm sure are fascinating, though you have to be skeptical considering the bias Hapsburgs no doubt have.