One should not even have money in the stock market that they need for 5-10 years so that means being able to deal with watching it go up and down which is hard. A sell-off may be a buying opportunity for some. If invested one has to be prepared for corrections at any time. The US has been the place to invest over the last 3+ years. But nowadays it is all so intertwined that there is no safe haven.
This will blow over faster than anyone knows