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
Leadership Lessons From Former U.S. Senator Joe Lieberman
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Former U.S. Senator Joe Lieberman, who died yesterday at 82, leaves behind
a track record of professional conduct that can be a role model for other
leader...
18 minutes ago