Simple answer, It's not.

Approaching a horrible situation with calm acceptance and resignation is pathological insanity.

Don't let anyone tell you different. Especially not someone whose mind has been impaired by drugs.

Drugs alter your subjective experience, how can you then understand whether your experience is true, and you are not simply operating with a defective brain.

In these cases it is the latter. If it was natural to feel a certain way, and that feeling was advantageous to the survival of our species, then your brain would already be that way. Tamper with it at your own peril.

For my part, I will wish to maintain my knowledge of reality and make my last minutes count without any false sense of acceptance of the utter evil that is death.