> the life of such pig would not even begin, which is a good thing

The comment I was responding to said nothing about increasing the quality of life of any living beings. It only asserted that non-existence is a good thing. I made the assumption that they came to that conclusion based on the reasoning that a pig that does not exist cannot suffer. I made the extension that you can also prevent suffering by immediately ending a life. Yes, there is a distinction between failing to breed another generation and immediately killing all members of the current generation but the end result is the same.