Even if you tell them everything about bitcoin from its benefits and risks, they will still not care about bitcoin, because there are a lot of people who are stubborn and always doubt everything even though we tell the truth with them. moreover, not everyone likes risk or high volatility, many people prefer safe, low volatility, and that's why banking is still considered by many as an option. bitcoin is really not for everyone, and we don't need to impose our thoughts on them and force them.
Not only that, by giving unsolicited advice on this manner people will feel that you are treating them like fools, as if they do not know how to manage their money on their own, and while there are a few people which may appreciate the advice the majority will hate it.
Besides it is also useless as the few people which would appreciate the advice would have invested in bitcoin anyway once they found out about its existence, and if anything they will be more comfortable with their decision as they would have come up with the decision on their own.