Every bitcoin wallet have unique private key for access. Also one can set password for his/her own. If anyone put private key in those place which can be hacked then bitcoin wallet will also hacked. Then don't use password same as other social media website. Use an unique password. Also you can write it down in paper and keep the paper in safest place. If anyone will be more aware of private keys or other access of account then his/her account must be safe form hackers.