why are sceptics so quick to comment on alternative medicine treatments?

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I asked somebody who's written many books on cancer, is a professor of oncology, has many initials after his name, and has worked in cancer research for many years, about what he thought of Royal Rife technology, Ozone therapy, and colloidal silver as alternative cancer treatments. And he replied that he didn't know much about them and so couldn't say.

Isn't that in stark contrast to the sceptics of this site, who because of an MD degree or their readings from a sceptic's website, are so quick to denouce alternative medicine treatments?
abacaxitoo, it's good to be cautious but wrong to put all the blame on alt med. look up jerry brunetti's story.