I can't really rationalize why China would throw stone on its own feet, but there are two reasons I could think of. One reason could be president Xi just can't

I can't really rationalize why China would throw stone on its own feet, but there are two reasons I could think of. One reason could be president Xi just can't back off because Xi is like Kim Jong-un in China. Xi has killed some of his political enemies and throw many of them to jail. If Xi shows any weakness to his internal enemies, he could not live long because he is playing too tough. It's like how a mafia boss works. Another reason is taking back some US dollar from HK reserve. China is facing insufficient foreign currency for importing goods for production, or even food in trade war with US. One example is pork production, which China has large export in the world, but it relied on corn imported from US, so facing increased tax harm pork production in China a lot, and added up with African swine fever, the situation is even worse. So, how would extradition law help? Basically there are some list of merchant in the hand of China who leaves China due to business disputed, bankrupt or any economic related prosecution. In China, they could start the court even with the absence of suspect. So, the court could proceed anytime and enforce any punishment without a lawyer to protect the suspect right. Without extradition law, it doesn't matter if the suspect left China. After the extradition law is passed, China would extradite those wanted list. And those wanted list could pay back some foreign currency in exchange. Though, it is really just sacrificing long term advantage for short term benefit. Both reasons are really dumb but they can't stop. Chinese using nationalism to justify the party existence, since the party make China a strong country. But if it is not, then the party would start falling apart.