I am not a pilot but the very many I travel in airplane and I have acquired one sure experience. Case of Hamburg seems to me that where the conditions weather were prohibitives the pilot could very well avoid to try the landing (being diverted the airplane on others airport), than for miracle it is not only ended in a disaster. Also I have happened myself in similar situations where - mainly for economic reasons - some pilots irresponsibles try however to land, heedless of the which had real risks for very bad the meterological conditions and of the terror of the passengers.