The important point is that if Wikipedia can be maliciously edited, it can also be restored quickly...as was done in these stories.

Keith Olbermann did a long bit on this last night, as HIS biography was one that had been altered....by someone at Fox News! The important point was that the 'alteration' only lasted about 1½ hours!

Of course a Wiki needs to be double-checked, especially about controversial material, but there are far more folks out there doing sane & accurate editing & correcting than there are doing sneaky & malicious editing. I really don't see why folks think they can get away with this.