It happens...

[cahrens]

I asked my reptile vet once about which way was the best and he told me that it's generally accepted that freezing is considered appropriate and humane.

 

[hhmoore]

From what I have read, April is correct about the "recommendation" for refrigerating snakes prior to freezing.
Arguments about which method is more humane are all well and good; but let us not forget the human factor. Culling, or otherwise "putting down" reptiles becomes a part of the hobby for many of us. These are our pets; and the prospect of stabbing them in the brain, smashing their heads, etc can be daunting. While bagging and freezing might not be perfect, it is probably the easiest method for somebody that balks at the idea of a more hands on approach.

 

[Robert Walker]

While bagging and freezing might not be perfect, it is probably the easiest method for somebody that balks at the idea of a more hands on approach.

Exactly my personal reasoning.