[orwin]

Pardons are useful in a single specific way. As the laws cannot be changed retroactively (this would be against the principles of democracy), you need something to handle the case where a law was too strict or too dumb and is rescinded. In my country, pardons are mostly issued by judges, and presidential pardons are also reviewed by judges (and always transformed into 'commutation of sentence' instead of full pardon, so that the person is still guilty)