I'm an agnostic from a Hindu family. The answer to your question is, the practices described in this article can't be. I could try to explain the mindset of the sheep (I refuse to call them 'people') who subscribe to this murderous ideology, but I won't bother.
Having said all that, parts of India where Kali worship is rampant aren't as violent as many places where it's not. Calcutta, unless you're a political activist, is a relatively safe city, compared to Bombay. Human sacrifice is the exception - not the norm, in contemporary India.
Posted to the wrong person--see my post # 29.