Simply notice the 'inflation adjusted declines' of 1974 and 1982 and the overall 1970-1982 correction and compare them to the 2002 and 2007 decline from 2000-2009 and see what happened after.
After two massive 50%+ declines, there doesn't "NEED" to be another massive wipeout for a long time. Investors do repeat patterns, so if they continue to repeat this pattern there is some downside risk of 13% and 20% over the near term, but over 150% upside potential which is 11:1 - 7:1 odds. Those are pretty good odds over the long term. For every 1 unit of downside risk you accept the potential for 7-11 units of upside. That's better than bonds by a long shot.
Keep this in mind when making your next investment decision.
All the best,
Tim
12:23AM EST 8/10/2017