Blackbeard is one of the few textbook definitions of pirate in One Piece. He's ambitious, he's unscrupulous, he's capable of stabbing his own crewmates, including his captain, to accomplish his goals, he's strategic when it comes to conflicts (with no fear of being seen as a coward), etc. I don't think that's the case, but he may be capable of messing with Bonney even after knowing that she's a child.
IMO, Blackbeard is the best villain of One Piece. As detestable as a villain can be and under the main theme of One Piece (piracy).