Ok, I didnt read all the replies, but I will share with you my experience. Not a sentimental person, I've hunted trapped, and fished my entire life. I thought this chicken killin would be a cake walk. Until I killed my first one. I knew my chickens would have to be culled eventually, but when the time came the extra roos went to a neighbor and not the freezer. Then, I got a mean hen. She would viciously attack the younger pullets. I caught her once, and marked her, well the next day I saw her attacking another pullet and that was it. I snatched her up, grabbed an axe and went to the chopping block. Since I killed her, I had to eat her. I didnt know nothing of tough old chickens, and she turned out about like shoe leather. I managed a couple bites (forced myself) seeing the chicken she was the whole time. Ok, well now I had killed one. And the next batch of young roos was growing up quick. Time came, and I steeled myself for it, and went whacking.
Now, this right here is what helped me overcome my adversity to eating MY chickens, so pay attention, lol. I killed them, processed them, and left them in the freezer for about a month! I ate no other chicken during this time. After a month had passed, I was craving chicken. During this time, the scene of the butchering faded from my mind. When I cooked the chicken, I was able to eat it much easier, 1) because I was really craving chicken and 2) because I hadnt just killed them the day before. The second chicken was easier yet, and by the third it really made no difference whether the chicken was mine, or store bought.
Agreed, though, on broilers. If your goal is to get chickens to eat, definitely get some broilers, as like the OP said, you have no choice but to kill them!