If they were passive, they wouldn’t care, because they should not have a reason to liquidate all equities during the few down years.
It really depends on luck, timing and inflation.
For example if you bought S&P 500 in Jul 1929, you got your investment back in 1955 (inflation adjusted). If you bought S&P 500 in Apr 2000, you got your investment back in 2014 (inflation adjusted).
https://www.multpl.com/inflation-adjusted-s-p-500
It really depends on luck, timing and inflation.
For example if you bought S&P 500 in Jul 1929, you got your investment back in 1955 (inflation adjusted). If you bought S&P 500 in Apr 2000, you got your investment back in 2014 (inflation adjusted).
https://www.multpl.com/inflation-adjusted-s-p-500