In many states snakes are treated like living gods on earth.. people living in such places hav a belief that killing snakes may bring harm to their families. This is superstitious. But scienfically also killing a snake will bring out distrubances in ecosystem. Bcoz, snakes also hav a major role in our food chain. If number of snakes decreases, it will also affect the existence of other species.
Yes killing snakes is harmful
in some places people believe but we cannot consider it as superstitious as there is scientific reasons like
it creates imbalance in ecosystem
and snakes are poisonous 
it destructs our food chain
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