And thus with the help of the law people are made to live as long as it is possible even when they don't want to. I'm afraid that when the policy is reversed, people would be "encouraged" to quit as soon as possible (and being afraid of such reversal the society clings to the current policy).
Somehow the society just can't understand the simple thing that the decision to quit or stay is personal and not for the society to make/enforce either way.