Quote from Tsing Tao:
People are shorting the market because the fundamentals suck, the amount of governmental meddling (central banks) in the market is unprecedented, risk/reward is overweighted, the financial system is corrupt, rigged and everyone is on the take.
The people you call the "bears" are people who believe that the manipulation can't continue forever and see the system for the sick reptile it has become.
How's that short working out for you sport.