I'm not a Jeremy Corbyn fan by any stretch but at least he has some sense about sensitive issues like the IRA and the IS situation. He recognises that things that USA do are also a reflection on the UK (and allied nations in general) and you need to address these issues very carefully indeed.
General election 2017: Corbyn pledges change 'at home and abroad' on terror - BBC News
He's basically saying that with the way Trump is behaving, we might want to distance ourselves somewhat from his policies and that Trump is adding fuel to the fire and that we shouldn't do the same. I agree.
In reference to the IRA - what happened in bloody Sunday was a massive mistake by the British Army and lessons have been learned from that. Bloody Sunday was basically a green light for mass IRA recruitment and its very easy to see why people were basically lining up to join the IRA. Those mistakes have been learned from, so lets not let history repeat itself and have the same thing happen with IS. If our behaviours are wrong, then the next step is more IS sympathisers starting to agree with their actions and things get worse, rather than better.
Its a very difficult situation to find the balance but using our military strength, changing laws etc to 'fix' the issue, isn't the solution. If only it was so simple.