soft+gentle Perhaps you are looking too deep and projecting modern thinking on to an ancient culture. The answer could be very simple.
The snake is an unusual creature it swallows its prey whole after poisoning it with deadly venom. It is feared by humans and animals alike. It is a prefect symbol for evil. Snakes have often been viewed in a negative light and are associated with black magic. Snakes or serpents have also been consider guardians of temples and holy places. Many tribes have used the snake as a totem .
The same people that decided the snake was an ideal symbol for evil, wisdom, and ceremony, also though that thunder was god’s arguing in heaven.
The human race has moved on just a tad.