@Bozo: As you yourself say, you are reacting from the gut. But as you also (presumably) believe in the "centrality of logic"

you must realize that a cool rational analysis of the situations is more probable in giving you a sounder pov. So lets see this rationally once more.
Here are two facts (now these are indisputable facts) :-
(a) Dubai is a city state modelled on the lines of singapore. To that extent it is the closest we have to western model in the middle east
(b) Dubai is fast diversifying away from oil-wealth. Right now only 20% of its GDP comes from oil. The rest is trade + investments + tourism (mostly)
Now as you claim we are not sure of how people in Dubai feel about America. Now I am not sure too. So I am not going to claim that they like America. But I am going to claim they like Dubai. And they see that there is a future for Dubai (unlike most other ME nations). A future in which they are integrated to the world economy. Now would you say that if you were a Dubai citizen irrespective of your feelings for America you will actually hurt Dubai's chances to spite America? if any company from Dubai supports terrorists and that can be proven then there goes their chances of integrating with the rest of the world.
Now, am I ruling out the remote possibility that some company of Dubai may actually help terrorists? No. It is possible. But no more possible than say a Bristish company or a Japanese company. Because all of them have teh same amount to lose. Just out of pure self-interest they will on the average behave exactly the same way. Love/hate for America has nothing to do with it. Hence, there is no additional risk in a Dubai firm financing US port operations.
But even apart from all that, since you believe (and I too believe to some extent) that we are in a low level conflict with Islam (which may spin out of control) don't you think we need as many friends on our side as we can get? Dubai is a perfect example of a friend. They may not be as cosy to US as say Britain - they may not be the ideal friend you would want - but they are the closest you got in the ME. They are capitalistic, they are progressing, diversifying from oil. If we cannot make them firends, - nay if we actually alienate them - then there truly is no chance of avoiding the civilizational conflict that you talk about and resort to guns in teh final anaylysis. Must we solve every problem with guns?
Lastly, you still have not mentioned why your gut tells you that this Dubai deal is dangerous and Citibank is not already a threat to the US financial system?