Yes they were once some years ago but recently they are anything but, and of course you know that full well.
That's just not correct and I would urge you to read the news in Northern Ireland before claiming otherwise. By volume, overwhelmingly, in the UK, there were more terror attacks by NI-based paramilitaries in 2016-17 than by Islamists. It is simply not correct to claim otherwise. As a frame of reference, there have been three Islamist attacks in the UK in the same time period (with today's currently uncategorised as we don't know who did it). I'm going to stick a finger in the air and say there were 50-100 attacks conducted by paramilitaries in NI, which include things like blowing up a prison officer, shooting the police (x several), kneecapping of delinquents (including one which went wrong and resulted in death), arson attacks on ethnic minorities to preserve paramilitary influence on estates, suspicious and viable devices left in public areas or on public infrastructure, a Royal Marine storing explosives in the woods,
Just because a bomb is on the railway line in Lurgan rather than London doesn't mean it doesn't count.
Perhaps you meant to describe Great Britain, at which point I would agree with you.
My overarching point is essentially that it's frustrating to continually see Northern Ireland totally forgotten about.
Obviously a motive is still pending for today's incident, which started off looking benign but now looks to be the work of a lunatic.