It's also a permanent solution to a permanent problem... life.

The rationale there is much the same as the doctor in Canberra telling me I shouldn't be a motorcyclist because I'm going to end up being a quadriplegic. If the decision is made consciously and in a rational state of mind then other people should accept it as theirs to make. That said, if the person is irrational, then they should be supported until they are rational.