And it's not just meat--I heard that quinoa demand in America is leading to mistreatment of workers in Peru. (Another reason to not eat quinoa besides the fact that it makes my gut feel awful).
There are definitely food choices that are "kinder" than others. Humanely raised meat is probably a "morally superior" meal to, say, bananas that were wrenched from the hands of third-world workers. In the end, we all have to do what feels right to us.