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That's the physiology of bitcoin investors. People keep on looking for more cheaper prices when the prices are already cheap and discounted. No one knows how low the bitcoin price can go but buying bitcoin at 30,000$ is indeed a very good price. Even if you do not want to invest everything at this price, it's better to buy some portion of bitcoin at current prices. In case the prices do not dump further, you will be happy that you have accumulated some bitcoins.
What they did is definitely wrong. We know that the market is unpredictable, we can't sure that on the next day prices went down more, it was just in our mind drawing such a possible and impossible situation. And this is the most common reason why many people are in regret, they overly think of what happens next without anticipating the possible change in the current trend.
We never have to ignore the chance, take this opportunity while it is still there, that was my honest take in regards to the current situation. We indeed not going to lose even the price will drop more as long as we don't sell any.