I'm going to tackle your discernment of "evil" and see if I can pinpoint it, because I had exactly the same feeling. Please forgive the distasteful imagery in the following, but I think you'll see what I'm trying to do.
It would seem as if the ultimate, unspoken ideal of the individual who wrote such stuff is the packaging of human meat "on the foot" as "efficiently" as possible, meaning maximum density with minimum overhead (i.e. energy and resource consumption, carbon production, etc). Clearly this is what it must be, once *the well-being and happiness* of those who live in such packing-house conditions (or lack thereof, rather) is not the primary consideration. It's almost as if humans are spoken of as a commodity, rather like chickens or other, perhaps herded, animals.
A point to ponder: why it is often the case that the same ones who won't eat meat or eggs from anything but free-range chickens because of the unspeakable cruelty of the non-free-range producers ( full disclosure -- I agree with that assessment -- it is cruelty ) think that this kind of thinking is OK for human beings, s long as it makes "Gaia" happy? You very likely would agree with me that such thinking is upside-down. I will not go into that now.
It is well and good to ponder over how 20+ billion individuals are supposed to share this planet, and indeed it is prudent to do so. But if these ideas are permitted to take root at the center of this pondering, the result can only be beyond horror, with the same old result -- the ones doing the 'central planning' somehow never seem to share the fate of those subjected to their plans. This simply cannot be permitted to happen. Such ideas must be refuted with vigor everywhere they crop up. Once a human being is seen as mere meat, Stalinist-Russia.Nazi-Germany.Maoist.China 2.0 is the inevitable result.
Historically the motivations for this are so that the very, very few can live the way they want. Consider comment http://news.slashdot.org/comments.pl?sid=1565742&cid=31304366. I think that captures it, and I believe that's what you're sensing.
Your assessment is correct. Perhaps I should limit that to saying only that I agree. It is evil.
Grace and peace
If you can count your money, you don't have a billion dollars. -- J. Paul Getty