Just because you have a right to do something doesn't make it the right thing to do. In this case, there are laws related to this sort of thing, and you have proof of the infraction, so you can get redress. Publicizing it won't help you personally, and could hurt you. You can argue that publicizing it will create an environment in which people will think twice before repeating this woman's mistake, and there is validity to that argument; but that's really what the laws are for. People already know that they should leave a note in this sort of situation, but some people don't do it for whatever reason. Public shaming, particularly on a national level for minor local infractions, will create a risk of outsized harm to the perpetrator, and contributes to a social environment in which people are punished by society, if not the law, for relatively minor infractions.