Its NOT about buying BTC,it's about COMMON sense!!!!!!!!!!!
So,you'll just drop money in any ole bank/exchange/hole in the ground

You NEVER EVER leave coin or cash in an exchange for ANY length of time !!!!!!! Do a trade,move it,never leave it........
I know that and you know that, but not everyone knows that. Everyday people`s experience of money is that you put it in the bank and leave it there, and take it out when you need it. It`s not common sense to them that they would need to shift it somewhere else to keep it secure.
This is the kind of gap in understanding that this community will need to bridge in order to gain widespread adoption. That won`t happen as long as we`re telling them they`re stupid for not knowing as much as us.
Really. Bitcoin will never be mainstream unless it becomes simple, secure, and hassle free for the average person.