People should use the software they feel comfortable with and adopt an attitude of security that includes updates, regular backups and awareness of changes in their computer system.
It is great if you prefer one browser over another, but blind faith in that browser is a serious security issue.
I agree that prompt updates, regular backups and checking the log files for unusual events are best practices. But you are totally overlooking the role of the operating system to provide a robust, secure environment.
I also agree that blind faith should not be used as a basis for computer security. Instead, compare the designs and the actual track records of the respective systems. If you make those comparisons, you will find that some systems are better than others, and the choice of operating systems does make a big difference in security. Microsoft has the worst track record because their systems are designed poorly.