Why not? The value of a conservative, to a member of a government union, is that of a dog.
Killing house dogs seems to be (at least unofficial) policy. Do you truly believe that those who kill dogs today will not one day be ordered/encouraged to kill “unwanted” people tomorrow?
Why do you suppose house dogs are shot with such regularity? It is to desensitize officers to the natural horror they would feel at gunning down law-abiding citizens.
Start with the dogs of the law-abiding citizens. Move on to the citizens themselves.