1) Saverin doesn't live here any more. So why does Schumer care?? The guy already paid his exit taxes.
2) Saverin was never even originally a US citizen in the first place -- he's Brazilian.
3) "enforcing Schumer’s proposal might run up against the “perpetual problem of trying to figure out what’s in a person’s mind” when he or she give up U.S. citizenship." This is key -- using motivation to determine the punishment for a crime seems OK (i.e. degrees of murder). But using motivation to determine whether or not something is a crime, just feels ridiculous.