I don't completely disagree with the points you're making, oldbirdy, and I am aware that I am not as well informed as I could/should be about the Kosovo War. However, I think I am correct in saying that no UN resolution mandated that war, meaning that it was not legal. It's possible that the perceived success of a supra-legal intervention in Kosovo emboldened Blair and his followers and contributed to the disaster in Iraq. The consequences of disregarding the rule of law may not be immediately apparent. Anyway, the point I am making is that the Kosovan intervention was, and is, morally controversial. Corbyn was not necessarily wrong to oppose it, particularly in the light of what happened afterwards.
Re: the IRA, I think it is important to point out that Jeremy Corbyn did not support the bombing campaigns of the IRA. What he did do was make some ill-advised nostalgia-infused comments at various commemorative meetings. A bad, bad thing to do, but this is not the same as being an active supporter.
flowers, Hamas, Hezbollah, etc. are not Jeremy Corbyn's friends, they are organisations with which he thinks it is important to have a dialogue. Many eminent statesmen (including Blair) have said that, in the business of peace-making, there comes a time when it is necessary to talk to terrorists.
I don't understand what you are getting at here: StopTheWar - which he led for a long time - is in favour (despite its name) of murdering "men, women and children" "in flagrant disregard for international law" ie "simply brutal vigilanti sm" - when those men, women and children live in Israel. Please can you explain this, flowers?