I'm not sure it's 'dangerous,' unless you're seeing through the eyes of a government, credit card company, or financial middle-man. Bitcoin empowers people, and removes companies or governments out of simple value transfers.

It's as though someone has created another Napster, except everyone's a 'node' and music isn't transmitted, 'wealth' is. Bitcoin is only as revolutionary or 'dangerous' as you want it to be.

HN folks may be interested in some of the discussions going on in Quora: http://www.quora.com/Bitcoin