Li’mashal, if you saw somebody unintentionally drinking poison, would you say “it is not my business” and walk away?”
Not a good example, because the person unknowingly about to drink poison will presumably be VERY glad you stopped him or her from doing so. Not necessarily so with the tznius police doing their thing. There is no comparison between the reality of mamesh saving someone’s life, versus believing you are saving his or her neshama. Most people you would accost in that way would be very annoyed with you,and think you are some nut-case walking the street looking for sinners. If you do not believe that I am correct, have you ever been stopped by Evangelical Christians determined to “save” your soul?