Devil’s advocate: it’s a silly sign, but it’s also supposed to be a joke. And, like most jokes, there’s some truth behind the intent. Which is to say, obviously women have far more rights than guns (don’t think anyone doesn’t literally think that), what they’re trying to say is that they wish protecting women’s rights were as important to politicians as protecting “gun’s rights” (preventing gun control).
That is how I read it, and if this is the most logically offensive sign out of a collection of hundreds of thousands, that’s pretty damn impressive.