[bittercynic]

>must take care of its weak and old

Agreed, but taking care doesn't necessarily have to mean extending life as long as possible, all other factors be damned.

In some cases close to me, I believe people were kept alive through treatments that they were unable to consent to, and I believed they experienced a lot of extremely unpleasant things at the end of their lives for no benefit, and were robbed of the chance to say a peaceful and dignified goodbye.