Hate to be that guy, but I think the sign is actually meant for the daughter, not the father. The rhetoric isn’t “hey, maybe don’t have sex with your kid?” it’s “yo girlie, those things your father did to you were totally not okay, even though he was drunk/apologized afterwards/whatever.”

I get that that still sounds painfully obvious, but trust me to people for whom “abuse” is their “normal,” messages like this handing out really obvious messages are still useful