Do you seriously think that selling coins in a falling market is a good idea? I think it is not so!
Don't stop him, let him sell everything he has. The sooner the market collapses to a certain point, the faster the whales are purchased and then we are all happy going up.
Yeah I also agree, selling an holding is not a bad at all because this market situation can cause panic and we respect that but the bad side is that you lose your chance when crypto market recover.