This is true it is not only the bounty participants who kills the project. Actually it's been discussed before and a lot of factors kills the project. There's also investors who do not have the trust and patience that able to sell their coins. Once a project is legitimate price will rise in the market.
the dev team held a bounty campaign to provide support for the promotion of their project, to attract investors. Bounty Hunter should be a supporter of the success of the project, right? but many blame the bounty hunter when the price dumps after distribution, even though the allocation for the bounty hunter is quite small. when a small part of it can affect the market and cannot recover, it means that many investors and other supporters who leave the project, could be because it is no longer profitable in the long run.