Old people don't need companionship. They need to be isolated and studied so it can be determined what nutrients they have that might be extracted for our personal use.
You are not permitted to kill a woman who has wronged you, but nothing forbids you to reflect that she is growing older every minute. You are avenged 1440 times a day.
The difficulty lies not in the new ideas but in escaping the old ones which ramify for those brought up as most of us have been into every corner of our minds.