"Reason for using the passive voice"

"We use the passive voice when + the focus of the sentence is on the object instead of the subject or when the subject of the sentence is general or unknown to the writer.

5 resons to use passive voice

1-"The 'performer' is not known."
2-"The 'performer' is not important."
3-"It is observe desirable to conceal the identity of the 'performer'."
4-"An unbiased tone is needed for academic writing."
("An impersonal tone is also used for process descriptions.")
5-"A delicate tone is needed to smooth over an error or difficulty."