I've seen lot's of people who complain to bounty hunters who dump their tokens after they get them. Why hate them? They have all the rights to sell whenever they want and bounty allocations are only 1%-5% of the total supply of the coin. I don't think it will do much to lower the price of the coin. I mean it's even good for the ICO investors as they will have a chance to buy more tokens with lesser price than the ICO.
Holding the tokens also doesn't mean it will make you rich. Some tokens get abandon by the developers so it would be better to sell at a good price than be left hanging in the end.
New coins that just landed in the market, get a dump, bounty hunters do not want to wait, but the real impact comes from private investors who have the lion's shares in the supply of the coin, bounty hunters even if all of them dump the coin, will not have a big impact on the price, just like what you post, they only have a small portion.