When is self-perceived burden an acceptable reason to hasten death?

Many terminally ill patients perceive themselves to be a burden to loved ones who care for them. The self-perception of being a burden can play a significant role in terminal patients' decisions to take courses of action, such as ceasing life-sustaining treatment or requesting physician-assisted suicide, that hasten death. I will use the term `burden-based decision' as a shorthand for cases in which a terminal patient's perception that she is a burden to her loved ones influences her decision to hasten death. When should we view a terminal patient's inclination to make a burden-based decision to be an ethical problem or a failure of treatment? And when should we view it to be an acceptable response rather than a problem or failure? I argue here that such decisions are acceptable more often than many who write on this topic imply.