It is something inside us
Many countries in the world follow some bizarre superstitions which would drive a normal person insane but
why does it happen?
Belief is a powerful thing whether it is positive, negative, true or false once believed in, it takes a power of its own.
You will end up seeing many sane people doing insane stuff when they are subjected to particular conditioning from childhood.
Every human believes in something and not believing is also a form of belief
So we should use reason to avoid falling in to superstitions