For those who don't want to read the text:
1. Keep your bitcoins on your wallet, not a online one.
2. Preferably on a cold wallet.
3. Split the bitcoins into multiple wallets for more security if needed.
the lesson will be that the general public won't get into something when these two elements are met (1) they don't understand it and (2) now realize that there is a distinct chance of losing their money, not bc of the volatility, but by a theft, fraud and/or negligence which they do not understand either.