You have an idea of what you're talking about. You don't have no idea of what you're talking about.
If stock prices plummet, then it is a great opportunity for someone with enough money to buy tons of it. For that person, it can be good.
But for someone who already owns a lot of stock, and has very little money, and needs to sell the stock to get money, and can't wait for it to peak again, and has to sell when it drops, the drop is bad.