There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Is Boeing Headed For A Buffett Bailout? Activists Want CEO Removed
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In the corporate world, history's tendency to repeat itself is
unmistakable, yet it often reappears under a new guise, particularly in the
cyclical downfal...
33 minutes ago