The headline asks the wrong question. Everybody has the freedom to decide what to do with their own life. You need a damn good justification to argue that anybody has the right to force someone else to suffer longer than they want to.
Self-termination is sometimes referred to as "a permanent solution to a temporary problem."
This idea resonates with many as being true at some level, however a terminal-illness can be regarded as different, i.e. not a temporary problem.
If there is not a terminal illness in the equation, would you agree that the situation tends towards the idea of "temporary problem/permanent solution"?
If there is not a terminal illness in the equation, is there any sort of condition or threshold you believe should exist to deprive a human being this "right" under any condition?
For example: should a human who does not have a terminal illness and has not yet reached majority age, have the "right" to self-terminate? Why or why not?
