Our world would have been exponentially more peaceful if there was no fear of theft. We would’ve left our doors open but still enjoyed our privacy and security. Unfortunately looking at the current scenario, that’s a rather impossible fiasco. And hence the need for doors and locks.
A similar case is applicable for the digital world where we have to assure complete data security. The simplest yet most important way to protect ones data even today remains with the use of passwords and robust access management systems.