Of course OP has good intentions, in this economic climate for me is crazy the idea of not buying some bitcoins but at the same time is a difficult suggestion because we don't know how the other person could react when there is a dump. Money is no joke, especially being someone's savings, or even worse, a company's savings.
It's barely about your intentions because a person would barely think about what your intention was if they had to suffer because of what you have suggested to them, so if a person suggests an investment to a friend with good intentions but the investment doesn't work out for the friend and he loses money, he would blame the friend for his suggestion and wouldn't say that it is okay, at least your intention wasn't bad. These things barely happen.
This is why I, personally, stay away from such things because I know how embarrassing it can become for me to face that friend if he loses money because of my suggestion even if he doesn't say anything. It is better that I leave him with what he is doing and do what I'm doing and stay away from such stress.