In return, whenever we are in office we will leave you alone and let you rule your part of the world, murder whoever you like (just not us, at those times), etc. They consider is a fine offer and can't see why anyone wouldn't take it. They think they had the same deal with Marxist rebels during the cold war, and national liberation movements during de-colonization. And they don't see any reason not to make the same offer to Islamic terrorists, or any good reason why those terrorists won't take them up on it.
All you have to understand is that their own power means more to them than murder does. Their enemies are republicans, not foreign terrorists. The one great crime in the world is depriving them of office, not murdering innocent people.
They have puppy dog followers who aren't this cynical, who can't think in consecutive sentences. Who think it is judgmental to be against anyone, who think nothing ever justifies use of force and especially not by us, who think it is all about oil and therefore wrong, and other kindergarten level propositions. They are dupes to the above cynics, political footsoldiers, votes. But not the source or drivers of the attitude and policy.
Have they ever looked at the history of appeasement?
You make the mistake of applying logic to the whiners on the left. They are basically insane: they are more interested in the RATs' attainment of political power than they are in the long-term survival of the Constitutional Republic known as the United States. The morons really think that they can "negotiate" with the likes of the rag-head terrorists; that somehow its the fault of the US that we were attacked and that if only we could change our foreign policy to accomodate these "victims" then everything would come out right. That way, we could gin up some more tax dollars to try and "pay off" the poor, misunderstood victims of centuries of Colonialism.
The left has been educated into imbecility by institutions that are themselves completely out of touch with any reality other than the one they have created for their little academic world. It is they who will ultimately pay the price if a jerk-off like John 'effin' Kerry is elected pres: the price of another major attack on the US and possibly an expanded and far more expensive global war. It is the "Way of The Rat".