...do you seriously believe nations would not need high security systems?...

We only need security systems because of crooks and traitors.

Also there is no such thing as absolute security. One of my Computer Science teachers was a security expert for NORAD and he told us of the tricks he played to break into their system, and he always succeeded.

US security systems are far more advanced than their British counterparts. So by the logic of McKinnon supporters It would be fine if I were to break into British military computers.


...my fears with regards to the likely US "justice...

The US justice system is far more respective of the rights of the accused than is the British.