How is it humane to kill an animal that does not want to die?

Graphic content deliberately avoided. Please click here to view reality of humane, welfare meat.
“There is no right way to do the wrong thing.” Ed Winters
If a serial killer drugs someone before killing them, is it humane if the victim did not feel any pain? [If this statement bothers you, please note comparing is not equating.]
Humane Meat: USDA does not regulate the term “humane.” If a company chooses to call its meat humane, it will submit documentation to USDA but USDA never makes in-person visits to verify any of the claims. Under “humane” meat, animals can still be mutilated by having their teeth ground down and their tails, horns, and genitals cut off without anesthesia. Still forcibly impregnated and their children taken away moments after being born. Gas chambers are considered humane but cause the animals to scream for up to 30 seconds. Free Range just means they are born in huts outside, but if and when they are moved into cramped sheds later they would still be called free range.
Cage Free: Still allows tossing just hatched male chicks in a grinder, female chicks still debeaked without anesthesia, and killed at 72 weeks. “Free Range” does not guarantee fresh air or sunlight required for all the birds in a shed, and can still pack 9 birds per square meter. Genetic modifications can cause bone weakness so severe that chickens cannot support their own weight.
Fish: The supposed humane method of harvesting and killing farmed fish is to suck them into icy water to freeze them to death. Far from humane, it is a slow and painful death, sometimes taking half an hour to kill.