More Trading Errors

Isn’t it odd how we only hear about these trading errors when they cause the market to drop? From Briefing.com:

11:29 ET Dow quickly rebounds 25 pts; Goldman Sachs futures desk error blamed for intraday rollover

11:23 ET Market tank blamed on erroneous trade by Goldman Sachs — rumor

11:21 ET Dow plunges 40 pts in just 5 min

Surely these types of errors happen on the buy side, but I can’t remember ever hearing about one.