I don't have a good answer for how I feel about killing and animals that were raised to have a good life. I get away with not having an answer to this question and defaulting to vegetarianism in two ways:
1) If I avoid all meat I cannot be held ethically accountable for it's provenance when, for example, a company's marketing department lies to you or the FDA does not sufficiently protect certain terms of art like "free range" which imply a lack of cruelty that wouldn't pass muster if I saw the treatment with my own eyes
2) If I am vegetarian, I will support vegetarian options, and I create support for companies and businesses that are unambiguously dedicated to reducing cruelty/suffering
1) If I avoid all meat I cannot be held ethically accountable for it's provenance when, for example, a company's marketing department lies to you or the FDA does not sufficiently protect certain terms of art like "free range" which imply a lack of cruelty that wouldn't pass muster if I saw the treatment with my own eyes
2) If I am vegetarian, I will support vegetarian options, and I create support for companies and businesses that are unambiguously dedicated to reducing cruelty/suffering