It is clear when creating a wallet, an instruction was posted to avoid giving or sending private keys to anyone, they should know and understand it very well.
That's what you can expect from a newbies since all of this is new to them so they probably do some mistakes. The only thing I can suggest is not to put the privatekey and address in one place or close to each other because its likely to happen when you want to share your public address to others that you will copy your privatekeys instead of the address. Always make a seperate file/record for privatekeys and wallet address only so whenever you want to check your balance or share your address then just open that file where your addresses stored.