Yes it was partly toung in cheek. These were good people who acted on principle.
However... I was young and it took me too long to see the hypocrisy of their thinking. They would happily feed the chickens but I would be the person who killed them... their angel of death. I wasn't even properly shown how to kill a chicken.
One day I was present when a pig was slaughtered a process which was overseen by a vet. That animal certainly knew it was going to die and did not like the idea. I was only 19, and was somewhat badly affected by the experience. For a while I even became a vegetarian but developed health issues as a result.
In the long run what I took from the idea was that meat has a cost. Life is not sacred but it is certainly precious. For that knowing it was worth it.