From a BBC interview:
King: To me terrorism is always wrong, but I think the IRA was a legitimate force that had to be dealt with.
BBC: A legitimate force? It wasn't a terrorist group trying to bomb and blow-up the democratically elected government of a sovereign state? That wasn't terrorism?
King: No, I would say it was a legitimate fight going on in Northern Ireland. Any time a civilian was targeted that was wrong. If you look back over the record, there was probably a greater number of, percentage wise, of civilians killed by the security forces in the world by the IRA. …To me terrorism is if you target civilians.
BBC: That's not the definition of terrorism. Terrorism is using violence to gain political ends.