Bounty hunters are alwasy blame for selling their tokens so quickly without waiting for the project develpment as outline in the roadmap. I don't think bounty hunters are to blame because a lot of bounty hunters hold their coins for years.
That is somehow true . There are many impatient and immature users and bounty hunters who just sell off their coins when the coin into some exchange .
That is one of the biggest reason of the coin dumping . But this cannot be controlled as the new users are emerging everyday and they are just scared to face the loss so they sell of right away.