Again we saw an exchange got hacked. There would be nothing to hack there if people didn't keep their coins on exchanges! For the love of Dog (lol), don't keep your coins on exchanges, start practicing safety, this is your investment we are talking about!
This is the risk mate, how can you trade if you don't have the coin on the exchanges. Its true that's exchanges nowadays are not safe because of the current hacking issues, But I think if its a big exchange I still your funds are still safe with them. Don't just put everything in the exchanges learn to secure some profit and again trust on the exchanges you are using, they will get even better soon.