I also strongly agree with your statement.
it would be better if you hold the tokens you have do not sell in a cheap price state
I hate to say this but good for him, atleast he did know what happens when he panicked and sell easily. We learned from our mistakes, not only him but personally i share the same experience just like him, and we don't want to happen that again.
I really do not hate to say it, which is good for him and any other person in his position. At the same time, I still thank them so much, because they are the reason I actually get a lot of gains after buying tokens that investors bought at a higher price during ICO at a lesser price.
It is good he is learning from or has learned from his mistakes, but I am sure a lot of people still would not most of the time, and they are the set of people that always cry wolf when they see what they have held in the past doing huge in percentage in the long run. 'I used to hold that coin or token' is not an excuse.