What do they think will happen? (that's rhetorical) These idiots. It's like they magically think surrounding and damaging someone's car will make them suddenly be on their side. Honestly, I don't see how it's different than any other lethal weapon. I don't condone harming people in most situations, but if you're clearly under assault and fearing for your safety self defense should be justified.
Also it literally is zombies. Chanting mindlessly, walking forward without empathy. Ceaselessly. Well, until enough cops show up.