Because German Shepherds, a canine who has served mankind for over a century, is also the target of BSL (breed specific legislation) and are being killed without being given a proper chance by shelters. These dogs are mislabeled as aggressive and are sometimes prevented from being seen by potential owners. It is as if it is a set up for them to be euthnized. Here is just one said example:

They killed her. RIP beautiful. I am so sorry.
Pet ID: A1184882
Sex: M
Age: 8 Years
Color: BLACK - TAN
Breed: GERM SHEPHERD
Kennel: 059
OC SHELTER, CA
714-935-6848
561 The City Drive South
Orange, CA 92868
Sunday through Saturday - 10:00 AM to 5:00

For more on this tragic killing of a German Shepherd, please visit: http://www.facebook.com/photo.php?fbid=4285097885639&set=a.3518380718189.2171742.1232140412&type=1&theater