I think it's normal and when we see it from your friend's point of view maybe we will also do the same thing,
no one thought something like that would happen to Luna because previously Luna's reputation could be said to be good and became the top coin,
but maybe your friend needs time to believe in crypto again
A part from crypto - losses occur be it business or personal life. So one cannot only trust what is going on gambling and in personal life.
Many people comes in trouble due to natural disaster , diseases so it doesn't happen with crypto - the losses are through out.