Many of the famous people pictured above, especially the Presidents, are/were Scots-Irish/Ulster-Irish, who are not Irish. They are the descendants of Protestant British invaders who became one of America's four founding British tribes.
Apologies for ACHTUALLYing.
(((beta_plus))) I have my eyes on you Hibernian.
Situation: a bunch of Irish Catholics engage in very bad behavior, as in organized crime or being even more drunk than usual.
(((Me))): Irish people are evil and must atone for their evil evilness.
You: But Aren't you Irish?
(((Me))); I'm not Irish. I'm Scots-Irish.
I am actually about 1/4 Pennsylvania Scots-Irish, which isn't the same as Tennessee, Kentucky, or Mississippi Scots-Irish. I'm not sure why but when I visited Nashville, which is basically the capital of the American Scots-Irish, it became extremely obvious since the white people just looked very different from me. I cannot describe it in words, but their faces were very unfamiliar despite being white Americans. It's the only time as a white American that I have felt like a foreigner in my own country.