Right, the active construction does grammatically require we put something there, where in the passive we get to omit it, which is why the passive is sometimes used for evasion. But if you're interested in whether someone is being evasive, just... look at whether they're actually assigning agency appropriately. Grammatical form doesn't answer that.

See also https://languagelog.ldc.upenn.edu/nll/index.php?s=passive for much related amusement.