It appears that everybody owns a piece of everybody. Maybe that is the key to stability.
Yes, it's certainly a factor.
A logical person weighs the pros and cons.
Insulting the most friendly and western like nation on the Arabian peninsula, where it could be less cooperative in the war on terror if we decide to alienate them would be very costly to us. The UAE is in a strategic position for the US in a very possible conflict with Iran where we have major military installations.
The cons is that they could have a larger propensity for their terminal operations to be infiltrated by terrorists. But since Dubai Ports World track record is, from what I can see, is spotless, the risk factor is negligible.