I read you link, and could not find the cite, and then did a search for the word "Europe" and "European" and came up empty. Perhaps your younger and sharper eyes and mind can find it. In any event, it is all bs. Kennedy was chatting about changing Western mores, and mentioned Europe. Big deal. What is a big deal, was his go with the flow via soaring rhetoric result, creating a judicial precept that is highly subject to a whole new round of judicial legislation, particularly in the hands of a court with another liberal on it.
The Europe cite brouhaha is just one of those red meat thingies, to stir up the crowd.