You can endlessly Google examples. My point isn't that I'm better, but that Goldman Sachs' predictions are nigh worthless. And that's before taking into account any conflict of interest.
They would also likely have been right in 2007, if it weren't for the CDS disaster. Same as LTCM in the 90s. Same with every crash -- they're right until something their models don't correctly model have a massive, outsized effect on things.
The swings, and combined with high leverage positions, can wipe out firms.