In your opinion what are the reasons that let someone start dumping his bitcoins and walk away ?
I personally (and this is just my opinion) that it's more panic then simply his need of money or something else , as we saw on the BitcoinXT last time , people started to panic and simply sold their bitcoins and that caused a drop in the price .
The people who throw away the Bitcoin they have and then choose to leave Bitcoin are the ones who do not trust completely in Bitcoin. They must be panicked because the price of Bitcoin goes down and they end up selling it to avoid even bigger losses. But if they are patient a little, luck is in those who have Bitcoin. This will certainly make the price of Bitcoin down but I remain confident that the price of Bitcoin will be at its peak again.