They live more comfortably than you do. In an environment literally designed to maximize their ability to grow.

Y'all continually fail to understand that farmers have a direct financial incentive to keep these animals happy and healthy. Stressed animals don't grow nearly as well as happy animals, and small animals don't make money.

Taking proper care of the animals is more profitable in the long run, even if you assume that all farmers are heartless monsters who enjoy watching needless suffering (we aren't by the way).