For me, in England, it is the disparity in treatment that is at the heart of the problem.

It used to be to get extradited from the UK it needed to be proved in court that, as near as damn it, you were guilty of the alleged offence. Nowadays the US just has to ask for someone and the UK Judicial system seems to bend over backwards to send them. Whereas, the US has refused to ratify the treaty and it is almost impossible to get US citizens extradited to the UK. A situation that is totally unfair and unbalanced.