So a murder suspect can appear in court and explain that someone gave him the wrong photograph, so it's not his fault?
The US, and many other countries, need to put forward a new law -- if an excuse applies to officials, then it applies to the citizenry. This is not because officials don't sometimes need extra freedoms, but because the vast majority of manmade disasters are "perfect storms" and because this case is a perfect illustration of the banality of evil.
Legitimate causes are just that and they won't cause problems. If, indeed, they are truly legitimate. Excuses mean that they knew they were doing wrong but felt that finger-pointing would confuse the issue for long enough for the storm to die down. Innocent people do not make excuses. Innocent people don't need them.
But this isn't something officialdom will ever accept. Nor will they tolerate a loss of power. So you don't take away their power, you merely insist that powers they claim are the same everywhere for everyone, and that the powers they deny are likewise denied to all. The sensible ones will see in seconds precisely where that's going to go and will get rid of the stupid ones very quickly. Not because they're morally better, but because such a rule is highly volatile and self-interest takes on a very different meaning when the consequences are unpredictable.