Another thing to consider is timeliness. While 3 million sounds like a lot, the reality is that this only accounted for 20% of their total stock. To delay killing the contaminated stock by using a more humane practice would have run the risk of exposing even more of the stock to disease. Killing each one with a bullet or knife would not only take considerably longer, but now you have the issue of cleaning up a highly contagious mess. To the person who suggested simply releasing massive amounts of chlorine gas into an open pit... dude...
It would be interesting if anyone here knows of a more humane yet equally effective method to exterminate such a large stock like that.
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