The General Assembly recognizes that many adult citizens of this State are subject to psychological or physical injury or exploitation because of physical or mental disability, impairment, illness or condition or other causes which render them incapable of providing for their basic daily living needs. The General Assembly, therefore, intends through this chapter to establish a system of services for impaired adults designed to protect their health, safety and welfare. The intent is to authorize only the least possible restrictions on the exercise of personal and civil rights and such restrictions may be permitted only when consistent with proven need for services.