Free-Range Meat

There are some pretty convincing arguments out there that it is almost always morally impermissible to eat meat. (For some discussion, see this FBC post.) How do we feel about free-range meat? I'm enjoying a free-range carnitas burrito from Chipotle right now -- am I doing something immoral? I have considerable sympathy with the view that the moral problem with the meat industry is not that it kills animals for food, but that it causes animals intense suffering from the deplorable way they're raised. Should I feel guilty that a pig was killed to make my burrito, even though he had a reasonably happy pig's life? I do think I have a moral responsibility not to torture pigs. I do not think I have one not to kill them.