In this case the extradition is extending the reach of shitty laws, but that is not an arguement against extraditions being a thing.

Of course it is. It’s why Germany doesn’t extradite citizens: You’re prosecuted in Germany, instead. Exception are other EU countries which are assumed to have sane laws, also, you have recourse to the ECHR while the US has plenty of people gleefully arguing that punishments can be cruel or unusual, they just can’t be both at the same time.