Yeah this is a highly disturbing story... if someone did something like this to my cat or dog.. man.. I don't know what I would do but it wouldn't be good for that person.
But I have to say, as a child I did used to pour salt on snails. My Dad told me the snails were bad cause they ate his plants, so i used to go around pouring salt on them, or sometimes i would take apart their shells that they were in and like squish them. I guess that's not different than a kid with a magnifying glass on an ant hill. Do you think that kids who use magnifying glasses or salt on snails have something wrong? I mean i'm perfectly normal college student party party chicks etc, so I know i'm not a serial but u know kids do that stuff ?
I don't think there is a correlation between cats and snails tho... I love my cat