Many people are in favor of "HODL" tactic and I am not against it as well, but inexperience with assets is going to destroy many portfolios full of ICOs, especially during the phase full of developing and brainstorming. Almost half of them is going to die in a few months, several won't make it through the first two years and even if your project has gone so far, no one can guarantee that you will not be in loss. I am personally a terrible day trader, but it is smarter to take out profit/ your initial investment while you have an opportunity, because another might never come. On the other hand, you can short it and actually gain greater influence over the network, which only strengthens your position and profit if the price is going up.
Truth. However, most of these people are so deeply invested into these projects that they can't do anything BUT hodl now. Otherwise, they'll be exiting on a significant loss. It's always best to cut your losses early, but this huge negative trend wasn't predictable at all, and everyone has been hoping we'll climb out next month, next month, next month! Next month passes and it's always next month! Play safe now, take risks when the market is strong.