Chicken, how safe is it?

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Think about it, chickens, pretty much since the beginning of their existence, have been a mistreated, stressed out animal. They have forever been chased around, crated together in a hectic, stressed out enviornment only to be gruesomely slaughtered. They are a very frightened, nervous animal and generation after generation after generation ect of chickens have lived this life. My point is this, what exactly are we eating when we eat an animal whose first ansectors up to them, have had this lifestyle. What is flowing through a chickens genes? I'm sure all that stress for all that time, produces some kind of extremley unhealthy substance in a chicken that we are not aware of. I mean, what if chickens could cause cancer, and we have never noticed it. It may sounds way out there, but think about it for a moment, think about a day in the life of a chicken that is bread to eat. When you see them on the freeway all crated together or what their living enviornment is like. We eat that. how healthy can that be? It is just like evolution, I'm sure over the course of time they have evolved some kind of gene that can not be healty. I don't know, what do you think?