What Does the Volatile Market Mean?

For the duration of recovery from the Covid-19 pandemic stock indexes have bounced around daily ranging from 300 point gains to 200 point losses. Realistically these moves should last at least a couple of days. So, does this mean that these market trends can't be trusted? One argument is that we shouldn't worry when indexes fall by hundreds of points one-day because they'll simply make it up within the next week. In fact, while the daily closing numbers have had a quite wide range, the trendline has generally been going up. This would lead some investors to think that there is no point in concerning themselves with downturns as eventually, the numbers will go up. However, with new data coming in from virus tests, it seems that we might be on the uprising of the second wave in some areas of the nation, which would convey that the rising trendline might start to waver. What's worse is that some might think a downturn to be "just one of those days" and continue to ignore the negative numbers. Ultimately, the rough but uprising wave that many have been riding for the past several weeks might turn into a disaster for quite a few people.