While I agree with your submission, I want to note that the aim of going into any investment is to make profit. Investors are into the Cryptocurrency business simply for profit making and that could be the reason why they sell their holdings at any favorable opportunity.
Again, the Cryptocurrency market is one that is hinged on speculation, the market price is highly determined by speculation more than the demand and supply factor.
So speculation in the Cryptocurrency space is something we cannot do without and without it, investors may not make profits from their investments.