The piece actually turns this into an argument: We don't like euthanizing our pets either, so, (shrug!) nbd if we feel icky about doing it to our parents.
There is a strain of self-assuredly realist bioethical thought that says: You think new thing X is terrible? Well, we already do similar thing Y! (Realizing that the possibility of X is a good reason to stop doing Y is never an option.)
I don't mean to say pet euthanasia is an example of this, to be clear. There really is a clear moral difference.
