The panic sellers face the loss. I won't suggest anyone to sell his coin if he bought it at higher rate and now the price is lower than that time. Agree with OP, just hold your coin until it goes up again. I have invested also while the price was up. And I'm waiting for the good future. I believe it will be up again.
There are some situation that Panicking is legit mate and don't just look in the bad side.
Like for example You have make a researches and in your perception the price of Bitcoin will fell down badly like what happen last march.
don't you think you will not Sell to buy again in deep?
price of Bitcoin that time fell from $9,000 to $4,000 thats a great chance to sell and buy again right?
so better look in both areas if the panic is for bad or in good.