> I used the believe the same, but as I found out on HN, there are a lot of people who won't bat an eye killing animals raised on their own land. Maybe they just never develop a bond with these animals

You develop bonds, just different ones and you learn to place limits because you know what the purpose of the animal is.

I still felt it when I was really little, but that was gone by the time I was a teenager and the reality that this was our living set in.