But you're only making assumptions, it's not something that you can guarantee with 100% certainty, bitcoin started increase a lot, we got to $10,000 and all news channels were euphoric and very optimistic and posted forecasts every time: "analysts predicting that by 2019 the price will be $40,000". even John McAfee made absurd predictions. the price reaches $12,000 and news channels remain euphoric and posting very optimistic forecasts and the cycle repeats up to $19,000. people sell their altcoins to buy bitcoin and used their credit/debit cards to buy bitcoin... so the price drops and many people enter in panic and sell their bitcoins... that's because people think: "if in a few months, the price went up from $1000 to $19000 - because it can not fall from $ 19000 to $1000? " so they sell!

What I want to say is that it is quite normal for people to sell in panic because nobody can guarantee with 100% certainty that the price will go up