The math is not relevant. I am not trying to discuss what percent of the time that Law is smiling at a slave action. What is relevant is that he is in fact smiling during a slave auction. We don´t have a video of the whole event, so we have no idea how often he was smiling. What matters is the action itself, which you dismiss as a ¨pre TS resting face¨, which is obviously so retarded you had to drop it.
Does grinning during an event not imply some level of enjoyment? What other connotation would an author be trying to make for a character in this context?
No, I am basing it on the fact that he attended a slave auction. Generally, attending an event implies that you like the event, or have some interest in it. I´m not sure what him looking tired is supposed to prove. I guess it´s part of your weird autistic statistic argument?
Nah, we know that Kidd dislikes the slave auctions and the celestial dragons based on what he said. The author decided to write a line about that for Kidd, and never law. Though, Kidd probably does get a sick satisfaction out of seeing celestial dragon depravity to justify his own actions, but I don´t actually care that much about his expressions by itself, we know why Kidd was at the auction, he explained it. Law never did.