Sometimes...
Sometimes, the effect is not apparent immediately, but in history, we see the nature and judgement of others have an effect. Such as the martyrdom of Imam Hussein (PBUH) in his mission to enjoin good and forbid evil, which has awakened the conscience of mankind throughout history. 2. Sometimes the bidding and forbidding is to protect the space for others. The call to prayers, the Adhan, is recommended even if there is no one to hear it.
Stopping at a red traffic light is an obligation, even if there are no other cars. So the preservation of the law and space and the respect of the law is an obligation. 3. Sometimes the sinner may not stop committing their sin, but successive reminders will leave a bitter taste in their mouth and at least would not be committing the sin with ease of mind, and one day, their conscience will awaken and be affected. 4.
For the protection of freedom, it is necessary to enjoin good and forbid evil, for otherwise society will be turned…