Maybe its because some are still in the stage being new in engaging the world of crypto and didn't understand yet process on how to get into it and what should be done in the crypto market and to community.
What must be done at the initial stage is to learn in order to understand everything, because without learning, whoever he or she will never know how the conditions are in it and will also never be able to adapt himself to everything in crypto.
^ The problem is that people are easily jumping in cryptocurrency investment thinking that it is very easy to make money on it, most of them did not even know or lack knowledge on it. They are just jumping because someone told them it is profitable and when they saw the price goes down they begin to panic and start selling to cut their losses. That is the problem of most newcomers now, they just lose their money and start giving negative feedback to cryptocurrencies. Nevertheless, we can not blame them.