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.
To some extent yes. After working for several months for a project, when they collect payments, they seem to convert the tokens to fiat to solve their personal need but other times, private and presale investors and team who recieve huge amount off bonuses causes dump too
That's the other factor that has to be seen than putting the blame on the bounty hunters.
Bounty hunters in total does not receive a huge amount and even if the majority would sell, it would not cause a big dump because it's just a small amount in the supply. The team should not list the project if they can ensure volume, but if they allow, no one should complain as it's just temporary if the project is legit.