This is a complete disgrace. This is an Irish citizen. If he's committed a crime on Irish soil he should be tried in and Irish court under Irish law.
The idea that countries, mainly America, can now extradite people all over the world sticks two fingers up at the idea of sovereign states.
What's next ? An American being sent to face the death penalty because there's a video of them dropping some chewing gum on the streets of Singapore ?
Sorry but this is a basic tenet of international law and has been for many many years, that you cannot direct harm in one country from another and be immune from prosecution simply because you did it from elsewhere.