This is not supposed to be easy; taking a life is a solemn thing. For me I do not want to ever get so calloused that I do not feel sad about taking a life. I want my meat chickens to have a lot of good days and one bad day.
My brother, who is a scientist, has a theory of conservation of difficulty. The theory goes that in any situation there is a certain amount of difficulty. You can move the difficulty around, but you cannot eliminate it. For example, anyone who had a computer in the 80's knows how hard it was to use a computer. You had to learn a lot about programming in order to use simple programs. Now computers are pretty simple to use because the designers and programmers have taken the difficulty away from the user and hidden it behind the scenes. So today you can fire up your computer and go directly to your desktop instead of start from the C prompt. To bring this back to chickens, if you are going to eat meat, then there is a certain amount of difficulty in the situation. Factory farms have allowed people to ignore that difficulty by raising chickens in conditions that are horrible and that do not respect the nature of the chicken -- the difficulty has been shifted from the people eating them to the chickens. I see the sadness and discomfort I suffer from killing chickens that I have carefully raised as my taking some of the difficulty on myself.
Anyway, I hope that makes sense.