Poachers are thieves. It's too bad your vet didn't get their license plate number. The state would have acquired a new pickup, some guns, and a good amount of cash (assuming your state laws are similar to the laws here.)
Nice reply norad45 (you beat me to it), we have similar laws where I live with the fines/forfeitures going to support Fish and Wildlife programs.
I have utilized wild fish/game in my home all my life as many of my neighbours do, it is quite normal here. I do not know if this would be called sustainance hunting though, we each purchase an annual small game licence for about $20.00, big game licences range from $35.00 to $45.00 depending on species and there are millions of acres of Crown Land to hunt on. Licence fees go back to support government Fish and Wildlife programs. All meat fit for human consumption must be utilized by law, there is no such thing as "Sport Hunting" where only the antlers are taken. The closest thing we would have to sustainance hunting/fishing would be legal Native or Aboriginal unlicenced harvesting.
I think there are many misconceptions about hunters and hunting. Hunters are usually just normal people who utilize natural resources in a consumptive, yet sustainable manner.
My 0.02 cents.
Mike