I figure these chickens wouldn't be alive if it weren't for us, and if asked, would they choose not to have ever existed in favor of existing and meeting a horrific demise?

Another thing to consider - if we genetically engineered chickens that couldn't feel pain, would it be unethical to debeak them?

Let me get this straight. Are you saying that animal cruelty is a non-issue? Or that its just a matter of perspective? Animal farming to me is reason enough for people to take up animal welfare as a cause. I could also add myriad other examples - trophy hunting, dog fighting, pulling out tusks out of elephants while they are alive.

No, I'm just giving you my justifications for ignoring the issue.

At no point did I want or expect that. I dont expect my causes to be taken up by anybody else. I can also give justifications for ignoring issues that are important to you or anybody else. Doesn't really serve any purpose.