"One big demand of the IRA was a united Ireland. I consider it a correct decision by the Britsh governments not to give in to this demand (against the will of a small majority) and to insist that such a result (united Ireland) only can be reached by parliamentary and democratic means."

... but they never gave into any demands, Wolfgang.
Their refusal to deal with the United Ireland issue was a handyexcuse for not dealing with any of it.

That is why the situation in the World these days is such as we have.

Successive major World governments have refused to deal properly with the Israeli/Palestinian conflict.

Osama Bin-Laden himself points to this festering sore as the focus of his jihad.

Would an intelligent person not try and focus a bit on that, perhaps?

Engagement might show a willingness from the major players in the present global guerilla war, to desist, when they see some of their demands being addressed.

It could be something for our respected leaders to wrap their heads around while they're waiting for the next strike

Would a responsible leader, or benevolent tyrant not try and do all in their power to protect their citizens, rather than let them suffer because of their own intransigence and higher adgendas?