I have a friend from college whose parents are still in mainland China, and I've heard these stories before. 50,000 is a small dog kill from what he's told me.
And it's ALL DOGS, regardless of vaccination. Vaccinating your dog is an owner's choice to protect the dog against the disease, not to protect it from being killed to prevent the spread of rabies.
You know the truly criminal part of this? Rabies is most often spread by RATS and other wild animals, not dogs. Killing the dogs is just a visible step, not an actual preventative.
h*ll is far to good for these *******s. I'd prefer they spend eternity up to their necks in the river Phlegethon, which is filled with boiling blood. It's the Seventh Level of h*ll in Dante's Inferno.
Dante had some really, really great punishments, and the Phlegethon is among my personal favorites.