I totally understand the mental block. I have it as well, but I like the flavor of meat and have taught myself how to think while in the process of butchering or eating something I grew for the purpose of eating. Have you ever had a friend (or spouse in my case) make something like kombucha or sauerkraut for it to live its short life on the counter or in a cupboard never to be eaten because they are scared of it? I view it sort of like that.
I grow meat birds for my family to eat for the year and to sell and we process them all ourselves. We also cull about 50 or 60 layers per year to make bone broth so we always have the best stock to use. I decided long ago that if I was going to eat meat, I will have grown it or known the person who grew it, and ideally, I will have butchered or helped butcher the animal. And I have stuck to that for about 6 years now with the exception of a handful of restaurant meals.
The first couple times I helped butcher turkeys for thanksgiving, I couldn't eat turkey or chicken for weeks (including the bird we had for thanksgiving!) but as I started my own business, and started processing all of our own roosters and meat birds, I got callous to it and don't even think about it anymore. In fact, after a long day of chicken butchering, I will gladly go inside and eat chicken. I think getting callous to it is part of it, and an important part. Just like how many murders we all see on television in a lifetime makes us insensitive to that image - People used to grow up butchering animals with their parents, grandparents, and neighbors. The children of the house were taught very early on where their food comes from and likely were made to participate in butchering tasks and definitely participated in daily animal chores to feed those animals that they were soon to eat. I think that is how, historically, people used to become calloused to the fact that you have to take something's life to be able to nourish yourself. Obviously, you don't want to starve.
Now we have modern conveniences like pre-packaged foods, fast food, protein powders, ect. There is no need to butcher your own food in order to survive as long as you can afford to purchase protein with dollars. You certainly don't even have to think about where the animal came from or how it lived (most have probably heard about how there could potentially be hundreds of cows in your fast food burger), and the marketing companies help you to not think about those things by wrapping their products in colorful packaging and splashing bucolic sounding catch-phrases and buzz words on it and by peppering the packaging or dining space with images of free ranging farm animals lazing around in fields of green grass, rustic fencing, and red wooden barns - so we can be distracted from thought while we eat our food as not to have a chance to think about the true origin of it.
Just my 2 cents.
Wendel Berry's books will change ones perspective on food as they have mine.