I think words are being played with, here.
Obviously no police officer is going to order a man to be shot if she had known he was innocent.
The phrase '..at the time' is important. She, presumably was at the end of a phone directing operations as best she could - would any of us like to have such responsibility?
Mistakes happen, and if we crucify every error made then eventually we will get the police force we deserve, nobody will do it.