+1 on @freemo - capital punishment is generally very wrong.
However of Nitrogen Hypoixia - It may be one of most humane ways to do it.
As a long time diver and Instructor Trainer I can tell you that nitrogen narcosis is a real thing... and of the "ways to exit this world" it would be in my top 10 list.
I am very resistant to nitrogen narcosis. I can breath air right up to the oxygen toxicity limit pressures while compltely ignoring the nitrogen narcosis... have hundreds of dives logged right at that line.
I feel like for me it wouldnt be quite as enjoyable :)
@freemo @stux
Yep.. I was Instructor trainer all the up to several closed circuit rebreathers.
I'd take a nitrogen / oxygen hit at high partial pressures anyway.