Contrary to popular belief that options = gambling, this is the #1 real utility of them. If 90% of your investments are tied up in S&P 500, it makes sense to hedge that with put options which provide a clearly defined max-loss over the contract duration of the option.

So in a period like this when those put options become valuable due to price drop and general IV, you can do as suggested and sell them to re-coup losses and maintain capital. It doesn't change the lifetime performance of your money placed in the corresponding security, but it most certainly improves the performance of your portfolio as a whole and limits the damage that can be done in any given downturn.

If you only hold securities, index or otherwise, your only recourse is time. I certainly wouldn't recommend trying to time the market, just like I wouldn't buy an insurance policy the day before a loss. That doesn't mean you avoid insurance altogether because you can't predict when you'll need it.