To me the wording, "Any particular reason you didn't do x?" wasn't an implied accusation. In fact it was the opposite. It was assumed that the original poster h

To me the wording, "Any particular reason you didn't do x?" wasn't an implied accusation. In fact it was the opposite. It was assumed that the original poster had taken all measures and had a good reason why they didn't take the action. It is similar to saying, "Have you considered...?" It is a less combative way to say, "You should have done x," which does implied that the original poster did something wrong.