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The overwhelming majority of these animals have spent their entire lives confined inside sheds, never going outdoors for a single hour. Their suffering isn’t just for a few hours or days, but for all their lives.
Even aside from the treatment of the animals, these factory farms produce incredible amounts of greenhouse gas, damaging the environment for everybody else.
Immoral in which subset of which particular morality?
Factory farms breed diseases which are resistant to medicine and can affect humans, posing a substantial health risk. A super virus that originates from the food supply has a large chance of driving human extinction.
The fact that humans (in modern societies) can now have a healthy and fulfilling diet without the need to kill animals for their protein, makes it immoral to continue killing sentient beings just for their taste. If we can avoid killing it is our moral duty to do so.
They are moral in my moral framework, because in it, 'me getting a lot less expensive meat' is a supreme cause to 'animal well being'. I still consider 'animal well being' a good cause, just subordinate.
If both causes can be consolidated, then it is immoral to support clinging to factory farms.
They are tasty.
A more humane solution would be to develop a drug like morphine that can make the lives of these factory farmed animals the most blissed-out heaven like existence for the entirety of their lives.