Grounspeak instructions do not mention cemeteries as no-go areas. They only mention on cemeteries is in a sentence: "Caches placed in areas which are highly sensitive to the extra traffic that would be caused by vehicles and humans (examples may include archaeological or historic sites or cemeteries)". Accordingly, they are speaking on sites sensitive to extra traffic.
My personal opinion is that cemeteries are part of cultural hertitage and one should also be able to present them in connection to geocaching. Of course one should not hide a geocache in a cemetery (even though there might be expections), but at least to me hedge around a cemetery is OK. There are a lot of geocaches around cemeteries in Finland and elsewhere and I do not see any reason, why they should not be there.