Dave,
I previously made this comparison about old wrongs.

You said you are from the States (or one of you did)
Are you a Native American?
If so your lands were invaded more recently than Ireland was.
Do you think that you should explode bombs in shopping malls and railroad stations because of that? Backshoot young police officers and service people, on and off duty?

Are you a Mexican American from California?
Then your state and others were taken by force from your ancestors much more recently than any part of Ireland.
Your Californian gold financed the industrialisation of USA. Your histories would have been very different.

Should you start killing the Gringos now?