I know these are standard “rules” for “effective” writing, sometimes the passive voice is best employed.
Mistakes were made ... but you are not focus on the subject, the mistaker.
Says someone who just wrote in the active voice.
If you use the passive voice the reader has a right to wonder what you are not saying. It may betray that you cant use the active voice because you dont know enough about what youre talking about, or because you dont want to explicitly say what you do know.If you are talking to the owner of a car, you might prefer to say The cars fender got dented rather than I dented your fender.