Some people were in exposed with those phishing sites behind and most probably their private keys were exposed online like sharing with friends or with strangers. Its really a sad experience if it happens you're the victim of being hacked, so one thing I can advise to most who encounter this kind of nightmare you should be more careful next time and the responsibility is always yours, no one to be blame but you personally. Phishing websites can be a replicate of myetherwallet, some characters omitted to somewhat trap every user now and then. But to avoid it you should have more secured antivirus and firewall of PC must be active all the time.