All terrorism is bad. Including both sides of the NI debate, the ANC and Apartheid government of South Africa, Hamas and the IDF all of which have deliberately targeted civilians.
But although the IRA did kill civilians, this generally wasn't their goal and they took steps to actively prevent that. Re: Eniskillen, read your link. Neither you nor I know the truth. Re: Harrods, acknowledged.
Kidnappings and murders in Ireland and NI were done on both sides, the IRA disarmed when the RUC, a British state run organization that also collaborated with terrorist paramilitaries was disbanded.
3 out of 3 killed in the Harrods bombing were civilians.
How many civilians were kneecapped or murdered in Eire and NI?
But sure, go ahead and believe that the P/IRA were the good sort of terrorists.