If they did not have specific indications of hydraulic failure that would affect the flight controls, going "all the way" may have been the best option given that it would be daylight on landing in Krakov while landing after burning down fuel in the U.S. would have had to be after dark.
Well I have no idea of the specifics of teh 767 but unless I can positively establish that the failure will not escalate I would be rather worried about crossing the Atlantic under such circumstances...
Looking forward to more info on what happened here
