Spiders target small prey and it's hard for their venom to kill something as big as a person. It's certainly unpleasant and can cause significant damage even when it doesn't kill, but snakes are responsible for far more deaths.

Animals have to contribute to society to be useful to the ecology of our planet?

> You cannot reason with these creatures with full of venom in their fangs even if the situation was an accident.

You can't really reason with any creature other than a human, and that's often spotty too!

But allow me present another opinion.

Snakes don't do things they don't have to do. They don't kill for no reason (cf humans, cats). They do what they have to do, without much emotion or fanfare. They shed their skin and don't carry extra weight. In other cultures, a snake is a symbol of wisdom, rebirth and healing (eg the rod of Asclepius).

Outside the symbolic arguments, I think snake venom does have some research use (eg blood thinners) and some would argue snakes are mechanically cool.

Just another perspecive ofc, and I respect yours.

In the end, snakes want to survive in a competitive world.