you only think this because you grew up buying food in stores.
killing humanely actually affects quality of meat. something man knew very well when he still mostly hunted and cleaned his own food. something people that farm know. you treat an animal well until it's last moments.
Japanese even have methods of killing fish and other animals humanely for the sake of better food quality
you are far removed from the food on your plate to the point that you think this is some kind of dumb comical thing. ok that's just how modern humans move...