Because they didn't know yet about bitcoin what willl the benefits on it thats why they too judgemental but let them be they will repent someday.
Agree with you lack of knowledge is the reasons for high panic selling it is only because people are not aware of actual benefit bitcoin can give them so name bitcoin is the future so no chance to dump my bitcoin, I think it is really good to know all about bitcoin when you decide to make investment so later on in future you will not get worry for selling it at panic as you will know it is a temporary situation.
This just makes sense. Really, this is all about losing the confidence in your coin because of lack of knowledge. If someone is interested in bitcoins and he wants to make better decisions and earn better profits so he must be indulged towards better learning. For that, you must trust your coin firstly and then acquire maximum knowledge that would be making your mind strong.