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Why do shareholders participate in shorting stocks?
For the same reason that people bet on different teams. Some think the Tigers will win, others thing the Yankees will win. They wager $5 on it. One of them wins, the other loses. In a short, one person bets that the stock goes down, the other bets that the stock goes up (or hold). You're basically saying "I think this stock is going to hold it's value or go up. If I thought it would go down, like you do, I would sell it myself right now. Instead, I'll let you have it for a while because when I get it back I think I'll come out on top."