Why does any thought of euthanasia makes people so squeamish?

Why does a billboard that reads “My life, my death, my choice” makes people so squeamish? If it invokes the thought of euthanasia so what? If a person who is conscious and lucid and feels they had a full life but they don’t want to die slow from a chronic disease why would anyone care? It seem to be OK and totally legal to end a life that can’t speak for itself because he/she will get in the way of Spring Break, a promotion, clubbing, or someone was way to drunk to require a condom be used, etc. If the right to live can be taken from someone who can’t speak for themselves the right to die should be given to someone who can speak for themselves.