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!
The thing is that cryptocurrency newcomers, and the majorty of people in the cryptosphere, find exchanges (and even web wallets) way more user-friendly than hardware/desktop wallets.
And it's obvious (at least for most of us since we've been in the cryptosphere for quite a while now) that exchanges aren't safe, but let's be honest, how many people actually care about safety nowadays? all they want to do is invest and make money, that's what the majority wants to do, and most people don't even keep up to date with cryptocurrency news so I doubt they'll ever know the consequences of keeping ALL your coins in a exchange.