I had 4 chickens as 'pets' they had names paige, pru, pheobe and piper, once they stopped laying we ate them, we actually had one for christmas dinner one year
How is this comparable though or a counterpoint to what the OP is saying? I'm sure you coped just fine killing those friendly intelligent chickens because you'd given them a good life.
The point is like most animals chicken are social, emotionally intelligent creatures and subjecting them to the conditions of factory farming for the duration of their lives is WRONG.
You may not have felt guilty for eating Paige, Pru, Phoebe and Piper, but I bet you would have had they spent their whole lives with you in tiny wire cages barely big enough to move round in, then taken to an animal murder factory before being delivered to your plate.
And if the answer is no you wouldn't have, then your opinion on chickens holds no water because you'd demonstrate a fundamental lack of empathy which would render your opinion on whether an animal should be treated empathetically, pointless.