Indeed it is safe, however, there are still people who keep on trying to steal thru hacking the coins that have been mined. In spite of this, there is nothing to worry since bitcoin is safe and secured cause they invested the right amount to keep the profit rolling out the market.

Just like how government and banks invested to make the money safe in spite of people trying to steal, bitcoin was in it safest place as well from any hackers. Just do what is necessary to keep your account details private so no one can get any information of your account.