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What might just as well ask: "How can you eat animals that you haven't raised and watched grow?" You don't know how they were raised, what they were fed, what conditions they lived in, etc.
As far as emotional attachment goes, a lot of it comes down to how you think about animals and your mindset going in. The reality of life for most of us is that meat is part of our diet. It is easier if you understand going in (and remember) that the birds you raise are going to be used to feed your family.
In a way, it is very sad that you are more comfortable eating animals that you have not raised, animals that were almost surely raised in conditions that are worse than those which you would have provided. Conditions that you would likely describe as inhumane is some cases. But eating meat, but not raising it yourself (or buying it from someone who does raise it themselves) you are promoting the commercial meat raising practices and conditions.
I'm not saying you are wrong or bad to buy meat at the supermarket (I buy most of my meat at the supermarket), I'm just saying that the emotional attachment to animals that you have personally raised is only one aspect of a complex issue.
Edit: I have only processed a few chickens myself and the hardest part for me is the killing. I use have-a-heart mouse traps. I'm not suggesting that any of this should be easy.