Call me pedantic if you want, but I don't see how you can agree with Éanna's definition when it's literally wrong by definition. What ye should be saying (imho) is that you don't believe that there's any organised or premeditated hooliganism in Ireland.
That's unless you believe there's a conspiracy in Collins, Oxford and Merriam-Webster of course, and have decided to forgoe dictionaries because of it. I take my dictionary's word for it, and it says there's soccer hooligans in Ireland.
adam