Here is a LONG discussion of the issue, with many Scots participants.

I am not sure how folks jumped from the fact that many Americans were upset that the man who murdered so many Americans was released so casually, to condemnation of the death penalty and the presumed 'entire culture' of the US....(I don't see anywhere that there was any attempts by the US to have the man extradited and executed....people were just upset to see his arriving home to a hero's welcome in Libya)