Wow we really are disagreeing.
Just so that we are agreeing on the definition of "rarely"
here is the list for 8 years of GW Bush (who is not exactly a softee). I think its pretty heavily used on this side of the pond. So was that point just a difference or rarely or you didn't realize it was still this heavily used?
As for abolished let me just give an example. Had it not been for the first 2 pardons: Philip Vigol and John Mitchell from George Washington Western Pennsylvania and Ohio would have been essentially occupied territory in 1791. They still had Fries rebellion even with most people liking how the Whisky rebellion ended and so the hostilities ended by the end of the 18th century. If you count Shays rebellion where they pardoned the leaders in Mass which was essentially the same thing but a bit north.
Think about what the war of 1812 looks like without those pardons. The US national government was having to fight an enemy at sea at the same time it had to maintain a hostile occupation on the other side of the adirondack mountains. I think you Brits would have won the war of 1812 and recaptured your colony. Jefferson, if he is even on the side of the National government and not trying to split Virginia off doesn't dare make the Louisiana purchase for fear or adding more western lands. Heck those western parts of the country might be actively trying to side with the French.
Its hard to know how this turns out but my guess is that the states fall apart and the territory which is now the USA at looks like Africa. And all so we could hang a few extra guys?
To pick a recent British example your judiciary was only too happy to essentially engage in an act of war by trying to arrest Tzipi Livni. And there were a few other earlier incidents where the executive had to leak these warrants to avoid committing acts of war. I would never trust judges on political matters. Fundamentally why have judges issue ruling the executive will not enforce?
Why? They could be honest about it. The government could just say, "we don't think holding Knox is in Italy's interest so we are sending her back". What would the outcry be? I have yet to hear anyone even try and defend how this is in Italy's interest.