“Public shaming as a blood sport” is the difference between keeping the public up to date with what is going on in the public square and transforming the same public square into a stand up comedy venue.
When this happens the public becomes hypnotized by the antics presented there and forgets to choose himself which are the really important issues and what to be done about them.
The public becomes easy prey for callous political operators (they don’t deserve to be named ‘politicians’ since they don’t give a damn about the ‘polis’) and democracy becomes mob-rule.
That’s what happened before the fall of (Ancient) Rome.

If you want to watch her speaking you can also click here to open the original TED page about her:
http://www.ted.com/talks/monica_lewinsky_the_price_of_shame#t-86823