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You can also tell people that you believe that bitcoin is the best of investments currently available, yet at the same time, each person has responsibilities to figured out whether and/or how to invest and each person is responsible to decide the consequences of their actions whether they invest or the don't invest, it is their choice, and if they choose to ignore bitcoin, they can have fun staying poor. They have to figure out the benefits and the risk, and we are not obligated by their choices, even if we are saying that we believe bitcoin is amongst the best of investments, if not the best investment currently available.
Simply showing the price chart of all time is more than enough to convince someone to invest but my point was before that they need a basic understanding of what they are getting into. It is really important from choosing the right market place to buy their bitcoin and choosing the right wallet for storing their crypto assets and how to avoid the potential scams that always prey on the amateurs.
There are no guarantees, and each person is responsible whether he gets into bitcoin or he chooses to completely ignore bitcoin, actions (and non-actions) have consequences. Even if I tell someone about bitcoin, I am not responsible for what they do, including that if there are risks, they have to research and figure that out. I have no obligation to warn them, even if I might mention that bitcoin could go to zero, but I might not say anything, also. Each person has to figure it out, whether we are talking on the web (and in these forums) or we are talking in person. I do not have additional obligations merely because I tell someone about bitcoin in person, and it could be the case that I had been doing them a favor by telling them about bitcoin, when they might not have had previously considered bitcoin... yet they still remain responsible for the consequences of their own actions in regards to the information that I presented, whether they act or not and whether they do further research or not.
No investment is guaranteed even someone can go bankrupt after investing on the golden assets but people who are new to the investment may not have that understanding, that comes from experience which is why forcing should not be the right move in my opinion, we can guide them, assist them but the decision should be theirs or else we may be blamed for their errors which is bad for the relationship between us and the person.