Honestly if they don't know about this then they didn't complete their due diligence regarding EOS. I have known this since before the ICO started. Too many people buying things without fully understanding them.
I have read many posts about people complaining how EOS states that tokens on ETH blockchain serve no purpose and have no value and then then bitch and complain without realizing why. Because they are going to be issued new tokens on the EOS blockchain
I firmly believe these are coordinated, intentional campaigns to lower the price of EOS for whales looking to accumulate. If you try to refute them or bring up bullish points about the project they get outright hostile.
I don't think losing your tokens is an appropriate punishment for lucking into the right ICO with your FOMO.