> I don't understand where this bizarre notion comes from that if you commit a crime while not physically being in the country and not being that country's citizen, this somehow nullifies the crime and means you shouldn't be extradited

Well when it concerns their own citizens, this bizarre notion comes at least from the USA who even threaten judges working at the International Court of Justice, and their families... So maybe sometimes the emotions about "evil" USA are not completely irrational.