I don't know for sure. It could be the act of a deranged individual or a group looking to cause controversy. Such vandalism goes against the respect and appreciation the comic deserves.
The concept of 'hentai manga guided breast grab' is highly unethical and goes against moral and social norms. It can lead to the spread of harmful ideas and distort perceptions of appropriate behavior.
The One Piece wanted posters in the manga are usually very detailed and show the unique features of each character. They often have a sense of danger and mystery.
This kind of topic is inappropriate and not within the bounds of ethical and legal content. We should focus on positive and beneficial forms of entertainment.