Peter Cox said this quote

“ Writer Brigid Brophy exposes [their motives] with great precision:Whenever people say 'We mustn't be sentimental,' you can take it they are about to do something cruel. And if they add 'We must be realistic,' they mean they are going to make money out of it. These slogans have a long history. After being used to justify slave traders, ruthless industrialists, and contractors who had found that the most economically 'realistic' method of cleaning a chimney was to force a small child to climb it, they have now been passed on, like an heirloom, to the factory farmers. 'We mustn't be sentimental' tries to persuade us that factory farming isn't, in fact, cruel. It implies that the whole problem had been invented by our sloppy imaginations. ”