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.
Agree, even though most bitcoin wallets has some sort of safety security features there's still some report that users got hacked and lost their bitcoins.
if they did set and follow the standard security they did not to worry ,
as bitcoin itself created to be the most secure payment system ,
the problem are , people did not know well yet about bitcoin ,
they just know about basic of bitcoin that it is as a currency and to invest.