For my part, I lined up with that section of the Labour left, headed by Ken Livingstone, which cultivated ties with Sinn Fein. While we hedged our support for ‘the armed struggle’ in ‘the six county statelet’ with this or that qualification, nobody in principle doubted that the IRA had some sort of moral right to utilise ‘the armalite’ as well as the ballot box against the British army.
Reconsidering the question nearly 30 years on, I still understand the logic of that position.
No wonder the left lionizes Guevara and Stalin and Mao, while denouncing Hitler. People can and should die because of socialism. It's only when they die because of fascism (is there a difference?) that it's bad.