I used to go fishing a lot as a child. I was quite desensitized to sticking a hook through the bait to the point where I was pretty cruel to the bait, which was live. I may have actually killed some of the fish I caught, but I don't remember. Being a kid, my dad and mom usually took care of preparing the fish. Also, many fish have really sharp spiny fins on top so I was afraid of some kinds of fish.
I've never killed any other animals for food. I would like to. I think it would be a good lesson. Not long ago I went to a friend's house for fresh crabs and I watched him put the live crabs in the boiling water. Nothing happened at all. Just lifted the lid and stuck them in and closed the lid. The crabs were kind of sluggish from sitting on ice.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Highest squat: 167.5 x 2. Current Deadlift: 190 x 3