You commonly refer to yourself as "the other person"? Weird, but okay. I will take that at face value.
It only makes logical sense to be against the killing done by others if you yourself have no involvement in killing.
We wouldn't want you to be the pot who called the kettle black.
What does the term euthanize mean? What are the numbers of euthanasia reported by PETA and what percentage of those are not sick and dying animals?