Can be used safely, but I think it depends on the users. The system itself fulfills its role by providing various security measures. But the users must take all necessary precautions to protect their data and their funds.
that's the thing that most of newcomers forgetting about,newbie are often lazy to enable any security option that's available and thinking that they money will be fine and not going anywhere but hacker could find out a hole in the system and potentially tricking and succesfully get into the account,when the money just lost,the user that's lazy blaming bitcoin,that's silly circle