Actually I don't want them to, you may call myself selfish which is true somehow but the main reason is I don't want to mix up finance with relationship because it mostly will end up in bad situation so just let them what they do and if tou feel they are doing something wrong then you can give your suggestions about how to succeed from it but its their choice to decide what to do and we can't analyse or force someone to invest in something what we are interested.
That is not a bad reflection on life though, I would agree with that. If you put finance and relations together, the relations would get damaged when finances are damaged. If you take money from your friends, even if they begged you to do it, then when you put it in bitcoin you will end up being upset that you lost money, even if they say nothing it will feel bad.
I did it for a family member, they wanted to put a small amount, an amount I could just give them even if all of it was gone, but when they lost it I felt terrible, they are back to profit again thankfully but it was a terrible feeling. So all in all, I understand your point of view, and that should not be an issue for you at all, it should be totally understood at this moment.