You wouldn't trust her to know when using it might endanger a bystander?
Good question. A concern would be that she would not do anything at all for fear of endangering a bystander.
Consider a situation where you are in your house during a blackout. You are "blind". And an intruder is banging on your bedroom door. Finally the door swings open. Do you shoot, or do you hesitate because it might be one of your kids trying to flee to safety? It's not such an easy call.