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.
How does this advice help the people who lost bitcoins in wallets of Mt Gox, Mycoin, Bitfinex, or a bunch of other unreliable pseudobanks? Again, unlike genuine banks, wallets don't provide government-funded depositor insurance.
Because there are more and more bitcoin companies that are actually started to back people’s losses in these hacks. Trust me these people want their company to succeed just as much as you want to see it fail. There are very smart businessmen trying to get these cryptocurrency banks off the ground because there is so much money to be made for feeding their greediness. We never forget physical banks also had failed many times across globe.