Why would I do something knowing it to cause distress when I don't need to?
Laura, you are on the internet, which means that you use electronics that use the rare mineral coltan, which is incredibly arduous to mine, and which has fueled a civil war in the Congo. The manufacturing process for the laptops and phones both you and I use have undoubtably caused distress during that manufacture to many actual people, not cows. And yet we carry on using them - we've made a conscious choice that balances our needs and wants against other people's needs and wants. People, not cows.
Do you ever go on a plane? Do you drive? Do you know what climate change is doing, and will do, to many people's livelihoods and homes? Do you know what it is doing to animal habitats, and what it will do? Do you have any idea of the distress that this will generate? And do you choose to get on a plane, or get in a car, anyway?
We all make constant decisions which determine how ethically we live our lives, whether conciously or not. If you are making some choices that you think takes you further along the ethical path, along the path of causing the least distress, then fine, good on you. But don't be under any illusion that this makes you someone who magically escapes causing distress to other living beings, because it doesn't.