The Simpsons is a social/political satire. These kinds of jokes will be made. I lived in NY during 9/11 and I can't get myself all worked up every time someone makes a distasteful joke about the Twin Towers, Muslims, terrorism, etc. I don't think you need to get worked up about it. The creators of the game/Fox/The Simpsons' writers all know the despicable things that the IRA has done, it doesn't stop them from making a joke about them nor should it. It wasn't directed at you.
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