You cannot directly blame coin payment for your loss without any proof. It is very easier for a hacker to access details from your computer with a hidden Remote administration tool. A java virus can remains undetectable for a couple of weeks stealing data from your computer checking your emails, etc just because you click a button on some unsafe site. Keeping your Antivirus updated will reduce the chances of attack on your devices.
A big YES, its not always the online wallet nor exchanges website. Sometimes, it's the hidden hacking movement on your computer and emails. Unfortunately, you encounter those kind of problems so learn from it, avoid risky website and update your anti-virus always.