Anyone who must tell people they know to invest in Bitcoin, should in the same vein tell them the risk involved in it so that they can highly choose if they should invest or have a change of thoughts about Bitcoin investment beforehand, so that nobody is to be blamed for any loss investment in Bitcoin.
I wonder what will make someone not explain to others the risk involved in Bitcoin and they still tell them to go ahead to invest. What are they really expecting? A profit investment that no one knows when it will come at, if not long term investment plans.
However, I find the act of not explaining in details of how Bitcoin investment is, as a wicked act. It's better to explain to others how the volatility of Bitcoin works so that they will be aware of it beforehand rather than happening to them unexpectedly, that will have them heartbroken