Great, another Kook-konspiracy for the kooks to kook over...
Bingo.
Maybe, but if the government IS behind it, this is the explanation I'd go with:
The government is killing off all the deer to make it impossible to be self sufficient and live off the land.
Creating dependency is what .gov does best. Twenty years ago, I'd have laughed at the notion; but now, it doesn't seem all that far-fetched.