I don't know what laws specifically apply to other European countries, but I know that Germany's data protection laws are stronger than those of most other countries.
In general (roughly), information about births after 1900, marriages after 1930 and deaths after 1960 is protected, unless the information was published in certain form (like in an obituary, or an autobiography); and even then, good luck finding it. It won't be available online, unless you're extremely lucky. Unlike the U.S., where things like census records are publically available, finding out anything about a recently (post-1960) deceased person in Germany is a real challenge.
When it comes to the parents and/or partners of famous people, this makes it almost impossible to do research without the active involvement of the family in question. Not to mention that some people very much don't appreciate to have their family history researched; compare the case of Sebastian Vettel, for example (comments on his profile, and the pages linked from there).
In short, I think it's a good idea to limit profiles from Germany to those old enough to be available: People born before 1900, or at least with a known marriage before 1930 (hoping that the marriage record gives enough data about their parents to bridge the gap). There are enough notables that meet this criterion.
Once users realize that it's actually worth looking at German profiles, and you attract the attention of people who know how to work with German records, there's actually a chance those profiles will no longer be ignored...