Although within this community Bitcoin is practically the only currency in which everyone believes, just look around a bit and we will find thousands of people who think otherwise.
At this point I wonder, what reasons should we give these people to make them realise that Bitcoin is a right choice? The first argument that comes to mind to convince a person who is sceptical about Bitcoin, is first of all that with Bitcoin you no longer need to delegate the custody of your money to a third party (banks, mutual funds, etc.): you are the master and you hold them. What else would you add?
Don't convince people to do action which is against on their will. You might get accused for doing illegal activities and want to victimized them if you pressure them to do something they don't know.
Better let them discover the whole aspect about crypto and show your own result because skeptical people are result oriented and they want to see if you are earning good with it before it catch their interest to participate on things they discover.
Usage of Bitcoin isn't illegal; thus, it's unlikely that he'd be accused of that. However, it's impossible to convince someone who's unwilling to listen and, more importantly, who simply isn't interested in Bitcoin or cryptocurrencies. It doesn't necessarily appeal to everyone; some praise it and some don't. Would you convince someone to like you? No, because it's pointless. Even if you actually manage to convince someone to purchase Bitcoin, there's a high chance of being blamed if money is lost on their end.
Just move on; not everything revolves around Bitcoin OP, and I understand your frustration because it's likely to have helped you, but not everyone wants to get to know more about it.