EDIT: general feedback is that this is incorrect.  A greater number of shorts is a BEARish indicator.  That makes sense to me.  Thanks

Intuitively (for me anyway), a higher number of short positions means there are a larger number of people who feel the price is going to tank.  The only reason I can think of to explain why this is a bullish indicator is because for every short position taken, there's someone on the other side of the trade taking a long position(?)  But if that's the case, maybe a higher volume of short positions shouldn't really be a bullish or bearish signal, but instead just a signal of price instability(?)  

Thanks
-YBB