Whether you give a shit about animal welfare or not: factory farming is causing some serious problems regarding future human health issues.
Animals in factory farming facilities are fed antibiotics excessively. To keep them from getting sick from the conditions they are held in and from the genetic indeficiencies they may have due to breeding. These antibiotics can lead to the emergence of antibiotic-resistant superbugs.
Considering that a pandemic in the not-so-distant future is areal possibility and not a dystopic horror story. That’s some real scary stuff.
You can find out more about this on the web of course – use your common sense to find the scientifically sound sources. Regarding books “Eating Animals” by Jonathan Safran Foer is a very considerate, personal and non-judgmental search for the truth about the effects of factory farming.