On Fri, 1 Feb 2008, Carl Beckhorn wrote:
We only require sources for quotes and facts that are challenged or "likely to be challenged", a compromise that I think is reasonable enough. Jimbo is right that dubious claims should be removed to the talk page - but only because they are dubious, not be because they are unsourced.
This is susceptible to troublemakers being able to cause trouble by following the rules. They just have to come through and arbitrarily challenge random facts to cause trouble, or even challenge facts that they know are true, but which they don't like.