I'm even mixed with psychological issues on this. We can help a lot of depression; some folks with bipolar disorder, schizophrenia, and a slew of others. But some, help is just barely help. If they've been trying treatment for 15-20 years as an adult, and have found life to be agonizing for the most part, and they've talked it over with a psychiatrist (who could have proceedures for due consideration)... yeah, I can't say I oppose it.

This does lead back to: Who is allowed to decide whether you live or die? The slippery slope you were speaking of : To me, those are simply beginnings. It is a step above complete illegality.