You can't just protect an ICO from the dumping folks.
Why is it that when there are dumps, the one that gets blamed are the bounty hunters? how big usually is the allocation that they get from the total circulating supply of that token? it is around 1%-10%. You should question the devs but you can't figure it out unless you follow their balance addresses.
If the devs is really serious about his project, it won't be a problem for them to accomodate some coins owned by bounty hunters. I think 1% -5% of the total supply is not too much. It would be great if there was a project like that, like previously Populous Platform project that their tokens rising 10x from ICO price shortly after the ICO ends, who easily accommodates all the bounty tokens owned by hunter bounties.