Can a human child explain that? Can most human adults explain that? Are you saying that they have less moral worth because it's over their heads?
everything has moral worth but not everything is moral.
so a case by case situation is taken. once a moral act fails then we know the mettle of a thing.
i go to the dentist to get my teeth clean twice a year. I lay there uncomfortably for 30 minutes to an hour. all this time enduring the discomfort and sometimes the pain. i know that this is necessary for over all health and especially oral health. i brush my teeth daily.
i take my rescues to the vet. they have rotten teeth, inflamed gums, but they will have to be anesthetized. They won't endure the cleaning. They don't care that the procedure is going to give them better quality of life. Reduce their long-term pain, etc., etc., the older the dog the harder to instill the importance of brushing teeth
allowing a thing, even oneself in suffering and abuse, is not moral. a dog doesn't understand the moral of good health. doesn't even care. all it understands is the fleeting pain and fear of a process that it doesn't appreciate