"my contention is that if you steal from an American who is living in America then that is where the crime happens"

So if the perpretator sets foot on US soil then he is in danger of being prosecuted. Seems fair enough but the issue is over extradition. It has even been discussed in parliament here how the extradition process isn't working. The new agreement was specifically set up so people accused of terrorism could be more easily extradited but the US seems (to British eyes) to have taken advantage of it by chasing lesser supposed crimes without fully reciprocating themsleves. People here do resent that and also do worry if it looks like British citizens are being unfairly treated and perhaps when the possible sentences, and treatment, seem far in excess of what would be accepted here. The US are going to have to take more note of these issues or else it will become more and more difficult for them to extradite people who maybe should be extradited.