Human life is sacred. It is a noble statement. I don't think there is anything wrong with your belief (about spitting in death's eye), except life isn't measured well as a binary option (dead or alive). (dead better than life)

In many circumstances death is by far better than life.

You need to factor in the quality of life. Its really what's important.

Take diseases like Alzheimers and neurodegenerative diseases. If I can't take care of my activities of daily living, and do not mentate - why on earth would I want to spend another day on this earth.

We can keep people alive for a terminally long time with tube feedings, rectal tubes and catheters and IV medications. Doesn't make living better than death. It also doesn't not mean that one decided to go quietly into the night.

Suffering is suffering, sometimes its better to stop suffering.