It is a foxes' fate to die as well and there are few quick easy deaths in nature; without the intervention of man they would mostly meet their fate at the jaws of dog's wild counterparts. I see little practical reason to alter this fate for a creature of little utility and high destructiveness.
On an emotional level I must admit a increasing distaste for the sources of protest being either "fuck the rich" communists and "population control, who needs it?" Enviromentalists. The "my only exposure to foxes is through disney" urbanites who back them while less offensive tend to be disconnected from the whys of the practice, being about as convincing as a greek banker.
Bookmarks