You know what this would have been a powerful moment in this book. Valentine is truly showing all of us first hand his bigotry and his unfounded hatred of Downworlders. This is in fact what Cassandra Clare originally intended to write.
Unfortunately for all of us, Cassandra Clare continues to be a freaking horrible writer. She used Jace as a way for us to finally really see Valentine’s evil, but Jace is still just as bigoted as his father. Do you guys remembered when Jace outright said that Downworlders were great for a quick fuck, but not worthy of anything else. Or all the times Jace and the other Shadowhunters including Clary, our plucky heroine herself have been horribly bigoted towards Downworlders.
As I have said over and over again to me, the only difference between our heroes and our antagonists is that Valentine is trying to commit genocide.