People lose more money every year stored in their bank accounts and atms as compared to Bitcoins, the only bitcoins that get stolen are because of either carelessness in handing private keys or investing in scams.
i think no people lost his money in bank, it's just lower interest if we compared with bitcoin interest (rising price).
but i think not all people who stored his money at bitcoin get interest, growing his money, some people who buying bitcoin in $700 and hold it, now lose arround 20% of his money.
I agree with your first sentence that earnings from bitcoin is more higher than the interest from banks, I also have my money in bitcoin instead of bank for that reason.
And in your second sentence, it is true that some people have lost their money when they bought them at $700 and after a month saw the price at $600 and $580 etc, but if they hold for more longer they can recover their loss and if they know about trade then they can start trade and can recover their loss sooner.