Shorting causes downward price pressure. It does not have to be naked shorting. Legitimate shorting has the same effect. Market price is determined by moving the price to balance supply and demand ... shares that are sold short legitimately will drive the price down. When the shares are covered, the opposite effect occurs.
caveat: buy in small amounts (100's) not large amounts (1,000's). In this environment, investors must take profits no matter how small - there's not enough AVAILABLE cash in equities markets right now. Buyers shouldn't be greedy as sellers are scared sh#@tless.
There is also the pervasive dream of market timing. Everyone seems to be talking about the timing, entering on a pullback, taking profits on a run-up ... all good, but everyone can't do it (that would be mathematically impossible) ... meanwhile, the ins and outs are scaring everyone even more.
I've seen a lot of talk of a $50-60 gold correction (I don't think so myself). If you have a $90 stock and it pulls back to $85, you take that in stride ... yet a POTENTIAL drop in gold sends everyone scurrying for the exits.