Euthanasia in Belgium

Two Belgian brothers, age 45, who were born deaf learned that bizarrely they were also going blind. Rather than face a life without the ability to see each other or communicate, they chose to be euthanized by lethal injection, which is legal in Belgium. They said good-bye to each other and family members and a doctor killed them. 

As a libertarian, I generally support the right of terminally ill patients who, at the end of their medical struggle, just want to go out on their own terms, to the extent that it is possible, and spare their families the pain of watching them suffer needlessly to the bitter end. Conversely, I also respect the rights of patients to fight to the bitter end of life regardless of the cost and discomfort it may cause for loved ones. End of life decisions are personal and should be respected, not dictated by the imperial State.

So in certain cases I support euthanasia or assisted suicide. However, these guys were in no physical pain and not otherwise "terminal", they just got screwed by life and as difficult as their futures would have been, is it OK for the State to kill them, as they wished, just because of their anguish over their situation?

I think this sort of thing signifies the general devaluation of non-perfect human life that many countries toward which many countries are tending. I'm not exactly comfortable with this.