It’s not respect for a sign, it’s respect for rights under the rule of law. I respect the right of free speech. Does that mean I support everything a person may have a conversation about? Nope.
My point is not that these people don’t have the right to say it, but that government should not beexpected to promote one religion bashing another. Might as well let the Klan put up an anti-Catholic display. I’m not in favor of vandalism, but the content of the sign puts it well outside the legitimate role of government.