Computer security, or maybe not

I know that certain sites like banks and online stores promise that your credit card information is safe, but at times i am not so sure. If a man created the codes and programs designed for internet protection then I feel that a different man could also decipher those same codes. is computer security really safe or are we brainwashed in to believing whatever is suggested to us.

My biggest concern comes from an incident that I had with my bank some time ago. One day my account had a balance and 2 days later for no apparent reason my bank had a zero balance. When the situation was first researched the problem could not be found, but upon closer examination it was discovered that a bank employee had set up a dummy account that slowly withdrew money from individuals accounts. The bank employee had masked the account to the point of almost being undetected for 3yrs. Then suddenly the program that the employee had been using crashed and the money that had been withdrawn in small amounts over 3yrs. came out in hug sums in a matter of hours. Many customers had adverse effects from this employees actions. Needless to say my money was returned. This personal experience makes me nervous about how secure computer security really is.