Some people think that if they this or that coin, it has only one way = 1000x profit

they never think this way, it starts with 1000x & whooop down to the ground to -1000x value.
Why they never think of such scenario ?
Because the scenario of trader is always want to get profit and never thinking about lose.
So when the price minus then they will just panic. Thats what they did. Panic and sell their asset into lose position.
As you said, they always want to get profit. They may already have sold it high and are waiting to buy when they think that the price is going to rise.
You should wait. One day the price will be higher.