This is a broad over-generalization. Watch "The China Hustle" if you would like to see some shorts going to extraordinary lengths to perform DD to inform their short position.
At the end of the day longs go long because they think the stock will appreciate and shorts go short because they believe the inverse. People can go long on a whim just as easily as people can go short on a whim. It doesn't mean that everyone in either camp does.
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